We divide 81013861 by 511
The aim is to understand the frequency of 511 in 81013861.

Moving on to step 1:
The number 511 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 511

Moving on to step 2:
511 goes into 81 0 times with a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Grab the next digit (0) from the dividend, add it to 81, then carry on: 810 / 511

On to step 3:
810 divided by 511 is 1 with a remainder of 299.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 511 away from 810, we end up with 299.
Fetch the next digit (1) from the dividend, attach it to 299 and continue: 2991 / 511

Advancing to step 4:
511 can be fit into 2991 5 times, resulting in a remainder of 436.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Deduct 2555 from 2991 and we're left with 436.
Bring next digit (3) of the dividend behind the 436 and repeat the process: 4363 / 511

Advancing to step 5:
511 can be fit into 4363 8 times, resulting in a remainder of 275.
The next digit of our result is 8. 
Result so far: 158.0
Deduct 4088 from 4363 and we're left with 275.
Take the next digit (8) from the dividend and append it to 275, then repeat: 2758 / 511

Advancing to step 6:
2758 divided by 511 is 5 with a remainder of 203.
Use 5 as the next digit of our solution. 
Result so far: 1585.0
If we take 2555 away from 2758, we end up with 203.
Take the next digit (6) from the dividend and append it to 203, then repeat: 2036 / 511

Advancing to step 7:
511 can be fit into 2036 3 times, resulting in a remainder of 503.
Use 3 as the next digit of our solution. 
Result so far: 15853.0
The remainder is 503 after subtracting 1533 from 2036.
Fetch the next digit (1) from the dividend, attach it to 503 and continue: 5031 / 511

Let's proceed to step 8:
511 goes into 5031 9 times with a remainder of 432.
The next digit of our result is 9. 
Result so far: 158539.0
The remainder is 432 after subtracting 4599 from 5031.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

Step 9:
511 goes into 4320 8 times with a remainder of 232.
The next digit of our result is 8. 
Result so far: 158539.8
Subtract 4088 from 4320 to get 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Let's proceed to step 10:
When dividing 2320 by 511, we get 4 with a remainder of 276.
Use 4 as the next digit of our solution. 
Result so far: 158539.84
Subtracting 2044 from 2320 leaves us with 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

Going ahead to step 11:
511 can be fit into 2760 5 times, resulting in a remainder of 205.
The next digit of our result is 5. 
Result so far: 158539.845
If we subtract 2555 from 2760, we get 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Step 12:
2050 divided by 511 is 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 158539.8454
Subtracting 2044 from 2050 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 13:
511 can be fit into 60 0 times, resulting in a remainder of 60.
The next digit of our result is 0. 
Result so far: 158539.8454
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 14:
The number 511 fits into 600 1 times, leaving a remainder of 89.
The next digit of our result is 1. 
Result so far: 158539.845401
Deduct 511 from 600 and we're left with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Going ahead to step 15:
511 goes into 890 1 times with a remainder of 379.
The number 1 becomes the next digit in our result. 
Result so far: 158539.8454011
Deduct 511 from 890 and we're left with 379.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3790, and continue the process.

After the division, we end up with 158539.8454011 and a remainder of 3.79e-06.