16639652 ÷ 409 
Our goal is to divide 16639652 by 409.

On to step 1:
If we divide 1 by 409, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 409

Step 2:
If we divide 16 by 409, we get 0 and a remainder of 16.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 16, we end up with 16.
Take the next digit (6) from the dividend and append it to 16, then repeat: 166 / 409

Let's proceed to step 3:
If we divide 166 by 409, we get 0 and a remainder of 166.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 166 after subtracting 0 from 166.
Include the next digit (3) from the dividend after 166, then repeat: 1663 / 409

Advancing to step 4:
When dividing 1663 by 409, we get 4 with a remainder of 27.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 1636 from 1663 to get 27.
Take the next digit (9) from the dividend and append it to 27, then repeat: 279 / 409

Advancing to step 5:
409 can be fit into 279 0 times, resulting in a remainder of 279.
Put 0 as the next digit of the answer. 
Result so far: 40.0
If we take 0 away from 279, we end up with 279.
Bring next digit (6) of the dividend behind the 279 and repeat the process: 2796 / 409

Moving on to step 6:
If we divide 2796 by 409, we get 6 and a remainder of 342.
Record the quotient 6 as the next digit in the result. 
Result so far: 406.0
If we take 2454 away from 2796, we end up with 342.
Include the next digit (5) from the dividend after 342, then repeat: 3425 / 409

Step 7:
409 goes into 3425 8 times with a remainder of 153.
The number 8 becomes the next digit in our result. 
Result so far: 4068.0
Subtract 3272 from 3425 to get 153.
Grab the next digit (2) from the dividend, add it to 153, then carry on: 1532 / 409

On to step 8:
If we divide 1532 by 409, we get 3 and a remainder of 305.
The next digit of our result is 3. 
Result so far: 40683.0
If we take 1227 away from 1532, we end up with 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Moving on to step 9:
If we divide 3050 by 409, we get 7 and a remainder of 187.
Use 7 as the next digit of our solution. 
Result so far: 40683.7
If we subtract 2863 from 3050, we get 187.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

Advancing to step 10:
When dividing 1870 by 409, we get 4 with a remainder of 234.
Write down 4 as next digit of the result. 
Result so far: 40683.74
Deduct 1636 from 1870 and we're left with 234.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2340, and continue the process.

On to step 11:
When dividing 2340 by 409, we get 5 with a remainder of 295.
Record the quotient 5 as the next digit in the result. 
Result so far: 40683.745
If we take 2045 away from 2340, we end up with 295.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2950, and continue the process.

Step 12:
The number 409 fits into 2950 7 times, leaving a remainder of 87.
Write down 7 as next digit of the result. 
Result so far: 40683.7457
Deduct 2863 from 2950 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Step 13:
409 goes into 870 2 times with a remainder of 52.
Record the quotient 2 as the next digit in the result. 
Result so far: 40683.74572
If we subtract 818 from 870, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 14:
520 divided by 409 is 1 with a remainder of 111.
The next digit of our result is 1. 
Result so far: 40683.745721
Subtracting 409 from 520 leaves us with 111.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

Let's proceed to step 15:
409 can be fit into 1110 2 times, resulting in a remainder of 292.
Put 2 as the next digit of the answer. 
Result so far: 40683.7457212
Deduct 818 from 1110 and we're left with 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Let's proceed to step 16:
409 goes into 2920 7 times with a remainder of 57.
The next digit of our result is 7. 
Result so far: 40683.74572127
If we subtract 2863 from 2920, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

In conclusion, the division gives 40683.74572127 with a balance of 5.7e-08.