We look at the division of 66150535 by 13 
The aim is to understand the frequency of 13 in 66150535.

On to step 1:
13 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 13

Going ahead to step 2:
66 divided by 13 is 5 with a remainder of 1.
The next digit of our result is 5. 
Result so far: 5.0
If we take 65 away from 66, we end up with 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 13

Let's proceed to step 3:
If we divide 11 by 13, we get 0 and a remainder of 11.
Write down 0 as next digit of the result. 
Result so far: 50.0
Deduct 0 from 11 and we're left with 11.
Fetch the next digit (5) from the dividend, attach it to 11 and continue: 115 / 13

Let's proceed to step 4:
13 goes into 115 8 times with a remainder of 11.
Use 8 as the next digit of our solution. 
Result so far: 508.0
Subtract 104 from 115 to get 11.
Fetch the next digit (0) from the dividend, attach it to 11 and continue: 110 / 13

Advancing to step 5:
When dividing 110 by 13, we get 8 with a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 5088.0
If we take 104 away from 110, we end up with 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 13

Let's proceed to step 6:
65 divided by 13 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 50885.0
Subtract 65 from 65 to get 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 13

Advancing to step 7:
When dividing 3 by 13, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 508850.0
Subtract 0 from 3 to get 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 13

Moving on to step 8:
35 divided by 13 is 2 with a remainder of 9.
Write down 2 as next digit of the result. 
Result so far: 5088502.0
The remainder is 9 after subtracting 26 from 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 9:
13 goes into 90 6 times with a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 5088502.6
Subtracting 78 from 90 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 10:
13 can be fit into 120 9 times, resulting in a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 5088502.69
Subtract 117 from 120 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 11:
13 can be fit into 30 2 times, resulting in a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 5088502.692
Deduct 26 from 30 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 12:
13 can be fit into 40 3 times, resulting in a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 5088502.6923
Deduct 39 from 40 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 13:
If we divide 10 by 13, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 5088502.6923
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 14:
When dividing 100 by 13, we get 7 with a remainder of 9.
Write down 7 as next digit of the result. 
Result so far: 5088502.692307
If we take 91 away from 100, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 15:
90 divided by 13 is 6 with a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 5088502.6923076
The remainder is 12 after subtracting 78 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 16:
120 divided by 13 is 9 with a remainder of 3.
The next digit of our result is 9. 
Result so far: 5088502.69230769
Subtract 117 from 120 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

In conclusion, the division gives 5088502.69230769 with a balance of 3e-09.