22161578 ÷ 639 
Our goal is to divide 22161578 by 639.

Advancing to step 1:
639 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (2) from the dividend to 2 and continue with: 22 / 639

Moving on to step 2:
22 divided by 639 is 0 with a remainder of 22.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 22, we get 22.
Bring next digit (1) of the dividend behind the 22 and repeat the process: 221 / 639

Step 3:
639 can be fit into 221 0 times, resulting in a remainder of 221.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 221, we end up with 221.
Take the next digit (6) from the dividend and append it to 221, then repeat: 2216 / 639

Step 4:
2216 divided by 639 is 3 with a remainder of 299.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we take 1917 away from 2216, we end up with 299.
Include the next digit (1) from the dividend after 299, then repeat: 2991 / 639

Advancing to step 5:
639 can be fit into 2991 4 times, resulting in a remainder of 435.
Write down 4 as next digit of the result. 
Result so far: 34.0
Deduct 2556 from 2991 and we're left with 435.
Fetch the next digit (5) from the dividend, attach it to 435 and continue: 4355 / 639

On to step 6:
If we divide 4355 by 639, we get 6 and a remainder of 521.
Write down 6 as next digit of the result. 
Result so far: 346.0
If we take 3834 away from 4355, we end up with 521.
Take the next digit (7) from the dividend and append it to 521, then repeat: 5217 / 639

Going ahead to step 7:
The number 639 fits into 5217 8 times, leaving a remainder of 105.
Write down 8 as next digit of the result. 
Result so far: 3468.0
If we subtract 5112 from 5217, we get 105.
Take the next digit (8) from the dividend and append it to 105, then repeat: 1058 / 639

On to step 8:
639 can be fit into 1058 1 times, resulting in a remainder of 419.
Write down 1 as next digit of the result. 
Result so far: 34681.0
Subtracting 639 from 1058 leaves us with 419.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4190, and continue the process.

Advancing to step 9:
639 can be fit into 4190 6 times, resulting in a remainder of 356.
Write down 6 as next digit of the result. 
Result so far: 34681.6
The remainder is 356 after subtracting 3834 from 4190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

On to step 10:
When dividing 3560 by 639, we get 5 with a remainder of 365.
The number 5 becomes the next digit in our result. 
Result so far: 34681.65
Subtract 3195 from 3560 to get 365.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3650, and continue the process.

Going ahead to step 11:
When dividing 3650 by 639, we get 5 with a remainder of 455.
The number 5 becomes the next digit in our result. 
Result so far: 34681.655
If we subtract 3195 from 3650, we get 455.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4550, and continue the process.

After the division, we end up with 34681.655 and a remainder of 0.0455.