We look at the division of 66113521 by 519 
The aim is to understand the frequency of 519 in 66113521.

Going ahead to step 1:
6 divided by 519 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 519

Advancing to step 2:
The number 519 fits into 66 0 times, leaving a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Bring next digit (1) of the dividend behind the 66 and repeat the process: 661 / 519

Let's proceed to step 3:
When dividing 661 by 519, we get 1 with a remainder of 142.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 519 from 661 to get 142.
Fetch the next digit (1) from the dividend, attach it to 142 and continue: 1421 / 519

Step 4:
519 goes into 1421 2 times with a remainder of 383.
The next digit of our result is 2. 
Result so far: 12.0
Subtracting 1038 from 1421 leaves us with 383.
Include the next digit (3) from the dividend after 383, then repeat: 3833 / 519

Going ahead to step 5:
The number 519 fits into 3833 7 times, leaving a remainder of 200.
Put 7 as the next digit of the answer. 
Result so far: 127.0
Subtracting 3633 from 3833 leaves us with 200.
Take the next digit (5) from the dividend and append it to 200, then repeat: 2005 / 519

Advancing to step 6:
2005 divided by 519 is 3 with a remainder of 448.
Record the quotient 3 as the next digit in the result. 
Result so far: 1273.0
Deduct 1557 from 2005 and we're left with 448.
Fetch the next digit (2) from the dividend, attach it to 448 and continue: 4482 / 519

Moving on to step 7:
519 can be fit into 4482 8 times, resulting in a remainder of 330.
The next digit of our result is 8. 
Result so far: 12738.0
If we subtract 4152 from 4482, we get 330.
Bring next digit (1) of the dividend behind the 330 and repeat the process: 3301 / 519

Advancing to step 8:
519 can be fit into 3301 6 times, resulting in a remainder of 187.
Put 6 as the next digit of the answer. 
Result so far: 127386.0
Subtract 3114 from 3301 to get 187.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

Moving on to step 9:
The number 519 fits into 1870 3 times, leaving a remainder of 313.
Put 3 as the next digit of the answer. 
Result so far: 127386.3
The remainder is 313 after subtracting 1557 from 1870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3130, and continue the process.

Moving on to step 10:
3130 divided by 519 is 6 with a remainder of 16.
Record the quotient 6 as the next digit in the result. 
Result so far: 127386.36
If we take 3114 away from 3130, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 11:
160 divided by 519 is 0 with a remainder of 160.
The number 0 becomes the next digit in our result. 
Result so far: 127386.36
If we take 0 away from 160, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Let's proceed to step 12:
The number 519 fits into 1600 3 times, leaving a remainder of 43.
Record the quotient 3 as the next digit in the result. 
Result so far: 127386.3603
If we take 1557 away from 1600, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Let's proceed to step 13:
430 divided by 519 is 0 with a remainder of 430.
Use 0 as the next digit of our solution. 
Result so far: 127386.3603
Subtract 0 from 430 to get 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

On to step 14:
The number 519 fits into 4300 8 times, leaving a remainder of 148.
The number 8 becomes the next digit in our result. 
Result so far: 127386.360308
Deduct 4152 from 4300 and we're left with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Going ahead to step 15:
The number 519 fits into 1480 2 times, leaving a remainder of 442.
The number 2 becomes the next digit in our result. 
Result so far: 127386.3603082
The remainder is 442 after subtracting 1038 from 1480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4420, and continue the process.

On to step 16:
When dividing 4420 by 519, we get 8 with a remainder of 268.
Write down 8 as next digit of the result. 
Result so far: 127386.36030828
The remainder is 268 after subtracting 4152 from 4420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

In conclusion, the division gives 127386.36030828 with a balance of 2.68e-07.