Let's divide 13558915 by 663
The aim is to understand the frequency of 663 in 13558915.

Moving on to step 1:
1 divided by 663 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 663

Going ahead to step 2:
663 can be fit into 13 0 times, resulting in a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 13 leaves us with 13.
Append the next digit (5) from the dividend to 13 and continue with: 135 / 663

On to step 3:
663 can be fit into 135 0 times, resulting in a remainder of 135.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 135 leaves us with 135.
Take the next digit (5) from the dividend and append it to 135, then repeat: 1355 / 663

Advancing to step 4:
When dividing 1355 by 663, we get 2 with a remainder of 29.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 1326 from 1355 leaves us with 29.
Append the next digit (8) from the dividend to 29 and continue with: 298 / 663

Let's proceed to step 5:
When dividing 298 by 663, we get 0 with a remainder of 298.
Record the quotient 0 as the next digit in the result. 
Result so far: 20.0
The remainder is 298 after subtracting 0 from 298.
Append the next digit (9) from the dividend to 298 and continue with: 2989 / 663

Advancing to step 6:
663 can be fit into 2989 4 times, resulting in a remainder of 337.
The number 4 becomes the next digit in our result. 
Result so far: 204.0
Subtracting 2652 from 2989 leaves us with 337.
Bring next digit (1) of the dividend behind the 337 and repeat the process: 3371 / 663

On to step 7:
When dividing 3371 by 663, we get 5 with a remainder of 56.
The number 5 becomes the next digit in our result. 
Result so far: 2045.0
If we take 3315 away from 3371, we end up with 56.
Fetch the next digit (5) from the dividend, attach it to 56 and continue: 565 / 663

Going ahead to step 8:
If we divide 565 by 663, we get 0 and a remainder of 565.
The next digit of our result is 0. 
Result so far: 20450.0
The remainder is 565 after subtracting 0 from 565.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5650, and continue the process.

On to step 9:
663 goes into 5650 8 times with a remainder of 346.
The next digit of our result is 8. 
Result so far: 20450.8
Subtracting 5304 from 5650 leaves us with 346.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

On to step 10:
The number 663 fits into 3460 5 times, leaving a remainder of 145.
Write down 5 as next digit of the result. 
Result so far: 20450.85
The remainder is 145 after subtracting 3315 from 3460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Going ahead to step 11:
663 can be fit into 1450 2 times, resulting in a remainder of 124.
Put 2 as the next digit of the answer. 
Result so far: 20450.852
The remainder is 124 after subtracting 1326 from 1450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Moving on to step 12:
663 goes into 1240 1 times with a remainder of 577.
The next digit of our result is 1. 
Result so far: 20450.8521
If we take 663 away from 1240, we end up with 577.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5770, and continue the process.

Let's proceed to step 13:
663 goes into 5770 8 times with a remainder of 466.
The next digit of our result is 8. 
Result so far: 20450.85218
Subtracting 5304 from 5770 leaves us with 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

Let's proceed to step 14:
If we divide 4660 by 663, we get 7 and a remainder of 19.
The next digit of our result is 7. 
Result so far: 20450.852187
Subtract 4641 from 4660 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 15:
When dividing 190 by 663, we get 0 with a remainder of 190.
Put 0 as the next digit of the answer. 
Result so far: 20450.852187
If we subtract 0 from 190, we get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Going ahead to step 16:
1900 divided by 663 is 2 with a remainder of 574.
Record the quotient 2 as the next digit in the result. 
Result so far: 20450.85218702
The remainder is 574 after subtracting 1326 from 1900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5740, and continue the process.

The quotient of the division is 20450.85218702, and the remainder is 5.74e-07.