66578912 ÷ 518 
The aim is to understand the frequency of 518 in 66578912.

Going ahead to step 1:
The number 518 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 518

Advancing to step 2:
When dividing 66 by 518, we get 0 with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Grab the next digit (5) from the dividend, add it to 66, then carry on: 665 / 518

Moving on to step 3:
When dividing 665 by 518, we get 1 with a remainder of 147.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 147 after subtracting 518 from 665.
Grab the next digit (7) from the dividend, add it to 147, then carry on: 1477 / 518

Advancing to step 4:
If we divide 1477 by 518, we get 2 and a remainder of 441.
The next digit of our result is 2. 
Result so far: 12.0
Deduct 1036 from 1477 and we're left with 441.
Append the next digit (8) from the dividend to 441 and continue with: 4418 / 518

Step 5:
When dividing 4418 by 518, we get 8 with a remainder of 274.
Write down 8 as next digit of the result. 
Result so far: 128.0
The remainder is 274 after subtracting 4144 from 4418.
Append the next digit (9) from the dividend to 274 and continue with: 2749 / 518

On to step 6:
If we divide 2749 by 518, we get 5 and a remainder of 159.
Use 5 as the next digit of our solution. 
Result so far: 1285.0
If we subtract 2590 from 2749, we get 159.
Append the next digit (1) from the dividend to 159 and continue with: 1591 / 518

Step 7:
If we divide 1591 by 518, we get 3 and a remainder of 37.
The number 3 becomes the next digit in our result. 
Result so far: 12853.0
The remainder is 37 after subtracting 1554 from 1591.
Include the next digit (2) from the dividend after 37, then repeat: 372 / 518

Let's proceed to step 8:
The number 518 fits into 372 0 times, leaving a remainder of 372.
Use 0 as the next digit of our solution. 
Result so far: 128530.0
Deduct 0 from 372 and we're left with 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Advancing to step 9:
3720 divided by 518 is 7 with a remainder of 94.
Put 7 as the next digit of the answer. 
Result so far: 128530.7
The remainder is 94 after subtracting 3626 from 3720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Let's proceed to step 10:
The number 518 fits into 940 1 times, leaving a remainder of 422.
The next digit of our result is 1. 
Result so far: 128530.71
Deduct 518 from 940 and we're left with 422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

Moving on to step 11:
518 can be fit into 4220 8 times, resulting in a remainder of 76.
Write down 8 as next digit of the result. 
Result so far: 128530.718
If we subtract 4144 from 4220, we get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Moving on to step 12:
518 can be fit into 760 1 times, resulting in a remainder of 242.
The next digit of our result is 1. 
Result so far: 128530.7181
Subtract 518 from 760 to get 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

Going ahead to step 13:
2420 divided by 518 is 4 with a remainder of 348.
The next digit of our result is 4. 
Result so far: 128530.71814
Deduct 2072 from 2420 and we're left with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

On to step 14:
518 can be fit into 3480 6 times, resulting in a remainder of 372.
The number 6 becomes the next digit in our result. 
Result so far: 128530.718146
If we take 3108 away from 3480, we end up with 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Step 15:
518 goes into 3720 7 times with a remainder of 94.
Put 7 as the next digit of the answer. 
Result so far: 128530.7181467
Deduct 3626 from 3720 and we're left with 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Let's proceed to step 16:
The number 518 fits into 940 1 times, leaving a remainder of 422.
The next digit of our result is 1. 
Result so far: 128530.71814671
If we subtract 518 from 940, we get 422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

In conclusion, the division gives 128530.71814671 with a balance of 4.22e-07.