We're dividing 12873875 by 663 
The aim is to understand the frequency of 663 in 12873875.

Let's proceed to step 1:
1 divided by 663 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 663

Step 2:
663 goes into 12 0 times with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 663

Let's proceed to step 3:
663 can be fit into 128 0 times, resulting in a remainder of 128.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 128, we get 128.
Grab the next digit (7) from the dividend, add it to 128, then carry on: 1287 / 663

Step 4:
If we divide 1287 by 663, we get 1 and a remainder of 624.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 663 from 1287, we get 624.
Append the next digit (3) from the dividend to 624 and continue with: 6243 / 663

On to step 5:
The number 663 fits into 6243 9 times, leaving a remainder of 276.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
Subtract 5967 from 6243 to get 276.
Bring next digit (8) of the dividend behind the 276 and repeat the process: 2768 / 663

Moving on to step 6:
The number 663 fits into 2768 4 times, leaving a remainder of 116.
The number 4 becomes the next digit in our result. 
Result so far: 194.0
The remainder is 116 after subtracting 2652 from 2768.
Fetch the next digit (7) from the dividend, attach it to 116 and continue: 1167 / 663

Going ahead to step 7:
1167 divided by 663 is 1 with a remainder of 504.
Put 1 as the next digit of the answer. 
Result so far: 1941.0
If we take 663 away from 1167, we end up with 504.
Append the next digit (5) from the dividend to 504 and continue with: 5045 / 663

Advancing to step 8:
5045 divided by 663 is 7 with a remainder of 404.
Record the quotient 7 as the next digit in the result. 
Result so far: 19417.0
If we subtract 4641 from 5045, we get 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Step 9:
When dividing 4040 by 663, we get 6 with a remainder of 62.
Use 6 as the next digit of our solution. 
Result so far: 19417.6
Subtract 3978 from 4040 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 10:
When dividing 620 by 663, we get 0 with a remainder of 620.
Write down 0 as next digit of the result. 
Result so far: 19417.6
If we subtract 0 from 620, we get 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Going ahead to step 11:
663 can be fit into 6200 9 times, resulting in a remainder of 233.
The next digit of our result is 9. 
Result so far: 19417.609
Deduct 5967 from 6200 and we're left with 233.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2330, and continue the process.

Step 12:
663 can be fit into 2330 3 times, resulting in a remainder of 341.
The next digit of our result is 3. 
Result so far: 19417.6093
Deduct 1989 from 2330 and we're left with 341.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3410, and continue the process.

Step 13:
663 goes into 3410 5 times with a remainder of 95.
The next digit of our result is 5. 
Result so far: 19417.60935
Subtracting 3315 from 3410 leaves us with 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Let's proceed to step 14:
663 can be fit into 950 1 times, resulting in a remainder of 287.
Record the quotient 1 as the next digit in the result. 
Result so far: 19417.609351
If we take 663 away from 950, we end up with 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

Let's proceed to step 15:
If we divide 2870 by 663, we get 4 and a remainder of 218.
Write down 4 as next digit of the result. 
Result so far: 19417.6093514
If we take 2652 away from 2870, we end up with 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

Step 16:
When dividing 2180 by 663, we get 3 with a remainder of 191.
Record the quotient 3 as the next digit in the result. 
Result so far: 19417.60935143
If we subtract 1989 from 2180, we get 191.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1910, and continue the process.

The final result is 19417.60935143 with a remainder of 1.91e-07.