We look at the division of 81536817 by 647 
The aim is to understand the frequency of 647 in 81536817.

On to step 1:
647 goes into 8 0 times with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 647

Moving on to step 2:
If we divide 81 by 647, we get 0 and a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 81 after subtracting 0 from 81.
Fetch the next digit (5) from the dividend, attach it to 81 and continue: 815 / 647

Moving on to step 3:
When dividing 815 by 647, we get 1 with a remainder of 168.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 647 from 815 and we're left with 168.
Grab the next digit (3) from the dividend, add it to 168, then carry on: 1683 / 647

Step 4:
The number 647 fits into 1683 2 times, leaving a remainder of 389.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we take 1294 away from 1683, we end up with 389.
Take the next digit (6) from the dividend and append it to 389, then repeat: 3896 / 647

Let's proceed to step 5:
If we divide 3896 by 647, we get 6 and a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 126.0
Deduct 3882 from 3896 and we're left with 14.
Take the next digit (8) from the dividend and append it to 14, then repeat: 148 / 647

Going ahead to step 6:
647 goes into 148 0 times with a remainder of 148.
Put 0 as the next digit of the answer. 
Result so far: 1260.0
Subtracting 0 from 148 leaves us with 148.
Fetch the next digit (1) from the dividend, attach it to 148 and continue: 1481 / 647

Let's proceed to step 7:
The number 647 fits into 1481 2 times, leaving a remainder of 187.
The next digit of our result is 2. 
Result so far: 12602.0
Deduct 1294 from 1481 and we're left with 187.
Bring next digit (7) of the dividend behind the 187 and repeat the process: 1877 / 647

Moving on to step 8:
If we divide 1877 by 647, we get 2 and a remainder of 583.
The number 2 becomes the next digit in our result. 
Result so far: 126022.0
If we subtract 1294 from 1877, we get 583.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5830, and continue the process.

On to step 9:
647 can be fit into 5830 9 times, resulting in a remainder of 7.
The number 9 becomes the next digit in our result. 
Result so far: 126022.9
The remainder is 7 after subtracting 5823 from 5830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 10:
70 divided by 647 is 0 with a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 126022.9
Subtract 0 from 70 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 11:
647 goes into 700 1 times with a remainder of 53.
The next digit of our result is 1. 
Result so far: 126022.901
Subtract 647 from 700 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

On to step 12:
The number 647 fits into 530 0 times, leaving a remainder of 530.
Record the quotient 0 as the next digit in the result. 
Result so far: 126022.901
Deduct 0 from 530 and we're left with 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

Advancing to step 13:
647 can be fit into 5300 8 times, resulting in a remainder of 124.
Record the quotient 8 as the next digit in the result. 
Result so far: 126022.90108
Deduct 5176 from 5300 and we're left with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Advancing to step 14:
647 can be fit into 1240 1 times, resulting in a remainder of 593.
Record the quotient 1 as the next digit in the result. 
Result so far: 126022.901081
Subtracting 647 from 1240 leaves us with 593.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5930, and continue the process.

On to step 15:
When dividing 5930 by 647, we get 9 with a remainder of 107.
The number 9 becomes the next digit in our result. 
Result so far: 126022.9010819
Subtract 5823 from 5930 to get 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

Step 16:
1070 divided by 647 is 1 with a remainder of 423.
The number 1 becomes the next digit in our result. 
Result so far: 126022.90108191
If we subtract 647 from 1070, we get 423.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4230, and continue the process.

In conclusion, the division gives 126022.90108191 with a balance of 4.23e-07.