Let's divide 12836553 by 644
We want to figure out the number of times 12836553 can be divided by 644.

Step 1:
1 divided by 644 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 644

Let's proceed to step 2:
644 can be fit into 12 0 times, resulting in a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Fetch the next digit (8) from the dividend, attach it to 12 and continue: 128 / 644

Let's proceed to step 3:
If we divide 128 by 644, we get 0 and a remainder of 128.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 128, we end up with 128.
Include the next digit (3) from the dividend after 128, then repeat: 1283 / 644

Going ahead to step 4:
644 can be fit into 1283 1 times, resulting in a remainder of 639.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 644 away from 1283, we end up with 639.
Fetch the next digit (6) from the dividend, attach it to 639 and continue: 6396 / 644

Step 5:
If we divide 6396 by 644, we get 9 and a remainder of 600.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
The remainder is 600 after subtracting 5796 from 6396.
Include the next digit (5) from the dividend after 600, then repeat: 6005 / 644

Advancing to step 6:
When dividing 6005 by 644, we get 9 with a remainder of 209.
Put 9 as the next digit of the answer. 
Result so far: 199.0
Subtracting 5796 from 6005 leaves us with 209.
Append the next digit (5) from the dividend to 209 and continue with: 2095 / 644

Moving on to step 7:
The number 644 fits into 2095 3 times, leaving a remainder of 163.
Use 3 as the next digit of our solution. 
Result so far: 1993.0
Deduct 1932 from 2095 and we're left with 163.
Include the next digit (3) from the dividend after 163, then repeat: 1633 / 644

Let's proceed to step 8:
1633 divided by 644 is 2 with a remainder of 345.
The number 2 becomes the next digit in our result. 
Result so far: 19932.0
Deduct 1288 from 1633 and we're left with 345.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3450, and continue the process.

Step 9:
The number 644 fits into 3450 5 times, leaving a remainder of 230.
Put 5 as the next digit of the answer. 
Result so far: 19932.5
The remainder is 230 after subtracting 3220 from 3450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Going ahead to step 10:
644 can be fit into 2300 3 times, resulting in a remainder of 368.
Put 3 as the next digit of the answer. 
Result so far: 19932.53
Deduct 1932 from 2300 and we're left with 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

Let's proceed to step 11:
The number 644 fits into 3680 5 times, leaving a remainder of 460.
The number 5 becomes the next digit in our result. 
Result so far: 19932.535
If we subtract 3220 from 3680, we get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Step 12:
644 goes into 4600 7 times with a remainder of 92.
The next digit of our result is 7. 
Result so far: 19932.5357
If we subtract 4508 from 4600, we get 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Advancing to step 13:
When dividing 920 by 644, we get 1 with a remainder of 276.
The next digit of our result is 1. 
Result so far: 19932.53571
The remainder is 276 after subtracting 644 from 920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

Let's proceed to step 14:
644 can be fit into 2760 4 times, resulting in a remainder of 184.
Put 4 as the next digit of the answer. 
Result so far: 19932.535714
If we subtract 2576 from 2760, we get 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Step 15:
644 can be fit into 1840 2 times, resulting in a remainder of 552.
Put 2 as the next digit of the answer. 
Result so far: 19932.5357142
If we take 1288 away from 1840, we end up with 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

Let's proceed to step 16:
The number 644 fits into 5520 8 times, leaving a remainder of 368.
The number 8 becomes the next digit in our result. 
Result so far: 19932.53571428
Subtract 5152 from 5520 to get 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

The final outcome is 19932.53571428, with a leftover of 3.68e-07.