39063616 divided by 661 
The aim is to understand the frequency of 661 in 39063616.

Let's proceed to step 1:
3 divided by 661 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 661

Let's proceed to step 2:
When dividing 39 by 661, we get 0 with a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 39, we end up with 39.
Fetch the next digit (0) from the dividend, attach it to 39 and continue: 390 / 661

Let's proceed to step 3:
390 divided by 661 is 0 with a remainder of 390.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 390, we end up with 390.
Take the next digit (6) from the dividend and append it to 390, then repeat: 3906 / 661

On to step 4:
When dividing 3906 by 661, we get 5 with a remainder of 601.
Write down 5 as next digit of the result. 
Result so far: 5.0
Subtracting 3305 from 3906 leaves us with 601.
Take the next digit (3) from the dividend and append it to 601, then repeat: 6013 / 661

Step 5:
661 can be fit into 6013 9 times, resulting in a remainder of 64.
The number 9 becomes the next digit in our result. 
Result so far: 59.0
Deduct 5949 from 6013 and we're left with 64.
Include the next digit (6) from the dividend after 64, then repeat: 646 / 661

Moving on to step 6:
646 divided by 661 is 0 with a remainder of 646.
Use 0 as the next digit of our solution. 
Result so far: 590.0
If we subtract 0 from 646, we get 646.
Bring next digit (1) of the dividend behind the 646 and repeat the process: 6461 / 661

On to step 7:
6461 divided by 661 is 9 with a remainder of 512.
Write down 9 as next digit of the result. 
Result so far: 5909.0
Deduct 5949 from 6461 and we're left with 512.
Append the next digit (6) from the dividend to 512 and continue with: 5126 / 661

Step 8:
The number 661 fits into 5126 7 times, leaving a remainder of 499.
Use 7 as the next digit of our solution. 
Result so far: 59097.0
The remainder is 499 after subtracting 4627 from 5126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4990, and continue the process.

Moving on to step 9:
If we divide 4990 by 661, we get 7 and a remainder of 363.
The number 7 becomes the next digit in our result. 
Result so far: 59097.7
If we take 4627 away from 4990, we end up with 363.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3630, and continue the process.

Advancing to step 10:
When dividing 3630 by 661, we get 5 with a remainder of 325.
Use 5 as the next digit of our solution. 
Result so far: 59097.75
Subtracting 3305 from 3630 leaves us with 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

Let's proceed to step 11:
3250 divided by 661 is 4 with a remainder of 606.
Record the quotient 4 as the next digit in the result. 
Result so far: 59097.754
The remainder is 606 after subtracting 2644 from 3250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6060, and continue the process.

On to step 12:
The number 661 fits into 6060 9 times, leaving a remainder of 111.
Record the quotient 9 as the next digit in the result. 
Result so far: 59097.7549
If we subtract 5949 from 6060, we get 111.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

Let's proceed to step 13:
When dividing 1110 by 661, we get 1 with a remainder of 449.
The next digit of our result is 1. 
Result so far: 59097.75491
If we take 661 away from 1110, we end up with 449.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4490, and continue the process.

Advancing to step 14:
661 can be fit into 4490 6 times, resulting in a remainder of 524.
Write down 6 as next digit of the result. 
Result so far: 59097.754916
Subtract 3966 from 4490 to get 524.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5240, and continue the process.

On to step 15:
When dividing 5240 by 661, we get 7 with a remainder of 613.
Record the quotient 7 as the next digit in the result. 
Result so far: 59097.7549167
Deduct 4627 from 5240 and we're left with 613.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6130, and continue the process.

Let's proceed to step 16:
661 can be fit into 6130 9 times, resulting in a remainder of 181.
The number 9 becomes the next digit in our result. 
Result so far: 59097.75491679
Subtract 5949 from 6130 to get 181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1810, and continue the process.

The final outcome is 59097.75491679, with a leftover of 1.81e-07.