65639130 ÷ 686 
The aim is to understand the frequency of 686 in 65639130.

Step 1:
686 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 686

Advancing to step 2:
When dividing 65 by 686, we get 0 with a remainder of 65.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 65, we get 65.
Bring next digit (6) of the dividend behind the 65 and repeat the process: 656 / 686

Let's proceed to step 3:
When dividing 656 by 686, we get 0 with a remainder of 656.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 656, we get 656.
Bring next digit (3) of the dividend behind the 656 and repeat the process: 6563 / 686

Step 4:
When dividing 6563 by 686, we get 9 with a remainder of 389.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Subtract 6174 from 6563 to get 389.
Bring next digit (9) of the dividend behind the 389 and repeat the process: 3899 / 686

Going ahead to step 5:
3899 divided by 686 is 5 with a remainder of 469.
Record the quotient 5 as the next digit in the result. 
Result so far: 95.0
If we take 3430 away from 3899, we end up with 469.
Append the next digit (1) from the dividend to 469 and continue with: 4691 / 686

Moving on to step 6:
The number 686 fits into 4691 6 times, leaving a remainder of 575.
Write down 6 as next digit of the result. 
Result so far: 956.0
Subtract 4116 from 4691 to get 575.
Append the next digit (3) from the dividend to 575 and continue with: 5753 / 686

Moving on to step 7:
686 can be fit into 5753 8 times, resulting in a remainder of 265.
Put 8 as the next digit of the answer. 
Result so far: 9568.0
Deduct 5488 from 5753 and we're left with 265.
Grab the next digit (0) from the dividend, add it to 265, then carry on: 2650 / 686

Moving on to step 8:
The number 686 fits into 2650 3 times, leaving a remainder of 592.
Put 3 as the next digit of the answer. 
Result so far: 95683.0
The remainder is 592 after subtracting 2058 from 2650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5920, and continue the process.

Going ahead to step 9:
5920 divided by 686 is 8 with a remainder of 432.
Use 8 as the next digit of our solution. 
Result so far: 95683.8
If we subtract 5488 from 5920, we get 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

On to step 10:
686 can be fit into 4320 6 times, resulting in a remainder of 204.
The number 6 becomes the next digit in our result. 
Result so far: 95683.86
If we take 4116 away from 4320, we end up with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

On to step 11:
The number 686 fits into 2040 2 times, leaving a remainder of 668.
The next digit of our result is 2. 
Result so far: 95683.862
Subtracting 1372 from 2040 leaves us with 668.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6680, and continue the process.

Let's proceed to step 12:
The number 686 fits into 6680 9 times, leaving a remainder of 506.
Use 9 as the next digit of our solution. 
Result so far: 95683.8629
The remainder is 506 after subtracting 6174 from 6680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5060, and continue the process.

Going ahead to step 13:
686 can be fit into 5060 7 times, resulting in a remainder of 258.
Record the quotient 7 as the next digit in the result. 
Result so far: 95683.86297
Subtract 4802 from 5060 to get 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Going ahead to step 14:
If we divide 2580 by 686, we get 3 and a remainder of 522.
Record the quotient 3 as the next digit in the result. 
Result so far: 95683.862973
The remainder is 522 after subtracting 2058 from 2580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5220, and continue the process.

Going ahead to step 15:
686 goes into 5220 7 times with a remainder of 418.
Record the quotient 7 as the next digit in the result. 
Result so far: 95683.8629737
The remainder is 418 after subtracting 4802 from 5220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4180, and continue the process.

Going ahead to step 16:
When dividing 4180 by 686, we get 6 with a remainder of 64.
The number 6 becomes the next digit in our result. 
Result so far: 95683.86297376
Subtract 4116 from 4180 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

The final outcome is 95683.86297376, with a leftover of 6.4e-08.