64519715 divided by 691 
The aim is to understand the frequency of 691 in 64519715.

Going ahead to step 1:
When dividing 6 by 691, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 691

Let's proceed to step 2:
If we divide 64 by 691, we get 0 and a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 64 after subtracting 0 from 64.
Include the next digit (5) from the dividend after 64, then repeat: 645 / 691

Advancing to step 3:
The number 691 fits into 645 0 times, leaving a remainder of 645.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 645 leaves us with 645.
Append the next digit (1) from the dividend to 645 and continue with: 6451 / 691

On to step 4:
691 goes into 6451 9 times with a remainder of 232.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtract 6219 from 6451 to get 232.
Fetch the next digit (9) from the dividend, attach it to 232 and continue: 2329 / 691

Advancing to step 5:
If we divide 2329 by 691, we get 3 and a remainder of 256.
Write down 3 as next digit of the result. 
Result so far: 93.0
Subtracting 2073 from 2329 leaves us with 256.
Include the next digit (7) from the dividend after 256, then repeat: 2567 / 691

Let's proceed to step 6:
691 can be fit into 2567 3 times, resulting in a remainder of 494.
The number 3 becomes the next digit in our result. 
Result so far: 933.0
Subtracting 2073 from 2567 leaves us with 494.
Fetch the next digit (1) from the dividend, attach it to 494 and continue: 4941 / 691

Advancing to step 7:
The number 691 fits into 4941 7 times, leaving a remainder of 104.
The next digit of our result is 7. 
Result so far: 9337.0
Subtract 4837 from 4941 to get 104.
Append the next digit (5) from the dividend to 104 and continue with: 1045 / 691

Let's proceed to step 8:
When dividing 1045 by 691, we get 1 with a remainder of 354.
Record the quotient 1 as the next digit in the result. 
Result so far: 93371.0
The remainder is 354 after subtracting 691 from 1045.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Moving on to step 9:
When dividing 3540 by 691, we get 5 with a remainder of 85.
The number 5 becomes the next digit in our result. 
Result so far: 93371.5
If we subtract 3455 from 3540, we get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Step 10:
The number 691 fits into 850 1 times, leaving a remainder of 159.
The next digit of our result is 1. 
Result so far: 93371.51
The remainder is 159 after subtracting 691 from 850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Step 11:
If we divide 1590 by 691, we get 2 and a remainder of 208.
The next digit of our result is 2. 
Result so far: 93371.512
If we take 1382 away from 1590, we end up with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Advancing to step 12:
691 goes into 2080 3 times with a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 93371.5123
Subtracting 2073 from 2080 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 13:
The number 691 fits into 70 0 times, leaving a remainder of 70.
Write down 0 as next digit of the result. 
Result so far: 93371.5123
Deduct 0 from 70 and we're left with 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 14:
691 goes into 700 1 times with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 93371.512301
If we subtract 691 from 700, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 15:
90 divided by 691 is 0 with a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 93371.512301
The remainder is 90 after subtracting 0 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Moving on to step 16:
691 goes into 900 1 times with a remainder of 209.
The number 1 becomes the next digit in our result. 
Result so far: 93371.51230101
If we subtract 691 from 900, we get 209.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

The final outcome is 93371.51230101, with a leftover of 2.09e-07.