We look at the division of 65636627 by 129 
The aim is to understand the frequency of 129 in 65636627.

Advancing to step 1:
6 divided by 129 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 129

Advancing to step 2:
65 divided by 129 is 0 with a remainder of 65.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 65 and we're left with 65.
Grab the next digit (6) from the dividend, add it to 65, then carry on: 656 / 129

Advancing to step 3:
The number 129 fits into 656 5 times, leaving a remainder of 11.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 645 from 656, we get 11.
Append the next digit (3) from the dividend to 11 and continue with: 113 / 129

On to step 4:
The number 129 fits into 113 0 times, leaving a remainder of 113.
Put 0 as the next digit of the answer. 
Result so far: 50.0
Subtract 0 from 113 to get 113.
Append the next digit (6) from the dividend to 113 and continue with: 1136 / 129

Advancing to step 5:
When dividing 1136 by 129, we get 8 with a remainder of 104.
Record the quotient 8 as the next digit in the result. 
Result so far: 508.0
If we subtract 1032 from 1136, we get 104.
Include the next digit (6) from the dividend after 104, then repeat: 1046 / 129

Let's proceed to step 6:
1046 divided by 129 is 8 with a remainder of 14.
Put 8 as the next digit of the answer. 
Result so far: 5088.0
If we subtract 1032 from 1046, we get 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 129

On to step 7:
When dividing 142 by 129, we get 1 with a remainder of 13.
Put 1 as the next digit of the answer. 
Result so far: 50881.0
If we subtract 129 from 142, we get 13.
Take the next digit (7) from the dividend and append it to 13, then repeat: 137 / 129

On to step 8:
137 divided by 129 is 1 with a remainder of 8.
Write down 1 as next digit of the result. 
Result so far: 508811.0
Deduct 129 from 137 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 9:
When dividing 80 by 129, we get 0 with a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 508811.0
If we take 0 away from 80, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 10:
When dividing 800 by 129, we get 6 with a remainder of 26.
Use 6 as the next digit of our solution. 
Result so far: 508811.06
If we take 774 away from 800, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 11:
When dividing 260 by 129, we get 2 with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 508811.062
The remainder is 2 after subtracting 258 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 12:
129 goes into 20 0 times with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 508811.062
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 13:
If we divide 200 by 129, we get 1 and a remainder of 71.
Record the quotient 1 as the next digit in the result. 
Result so far: 508811.06201
If we subtract 129 from 200, we get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

On to step 14:
129 can be fit into 710 5 times, resulting in a remainder of 65.
The number 5 becomes the next digit in our result. 
Result so far: 508811.062015
Subtracting 645 from 710 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 15:
129 goes into 650 5 times with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 508811.0620155
If we subtract 645 from 650, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

In conclusion, the division gives 508811.0620155 with a balance of 5e-08.