66857803 divided by 405 
We're looking to find how many times 405 goes into 66857803.

Step 1:
The number 405 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 405

Let's proceed to step 2:
The number 405 fits into 66 0 times, leaving a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Fetch the next digit (8) from the dividend, attach it to 66 and continue: 668 / 405

Step 3:
When dividing 668 by 405, we get 1 with a remainder of 263.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 405 from 668, we get 263.
Fetch the next digit (5) from the dividend, attach it to 263 and continue: 2635 / 405

On to step 4:
2635 divided by 405 is 6 with a remainder of 205.
Write down 6 as next digit of the result. 
Result so far: 16.0
If we take 2430 away from 2635, we end up with 205.
Include the next digit (7) from the dividend after 205, then repeat: 2057 / 405

Going ahead to step 5:
405 goes into 2057 5 times with a remainder of 32.
Write down 5 as next digit of the result. 
Result so far: 165.0
If we take 2025 away from 2057, we end up with 32.
Fetch the next digit (8) from the dividend, attach it to 32 and continue: 328 / 405

Advancing to step 6:
The number 405 fits into 328 0 times, leaving a remainder of 328.
Write down 0 as next digit of the result. 
Result so far: 1650.0
If we take 0 away from 328, we end up with 328.
Grab the next digit (0) from the dividend, add it to 328, then carry on: 3280 / 405

Going ahead to step 7:
When dividing 3280 by 405, we get 8 with a remainder of 40.
Record the quotient 8 as the next digit in the result. 
Result so far: 16508.0
If we subtract 3240 from 3280, we get 40.
Take the next digit (3) from the dividend and append it to 40, then repeat: 403 / 405

On to step 8:
405 can be fit into 403 0 times, resulting in a remainder of 403.
The number 0 becomes the next digit in our result. 
Result so far: 165080.0
If we subtract 0 from 403, we get 403.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4030, and continue the process.

Step 9:
The number 405 fits into 4030 9 times, leaving a remainder of 385.
The number 9 becomes the next digit in our result. 
Result so far: 165080.9
If we subtract 3645 from 4030, we get 385.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3850, and continue the process.

Step 10:
405 goes into 3850 9 times with a remainder of 205.
Write down 9 as next digit of the result. 
Result so far: 165080.99
If we subtract 3645 from 3850, we get 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

The final result is 165080.99 with a remainder of 0.205.