819863 divided by 66 
We're looking to find how many times 66 goes into 819863.

Step 1:
If we divide 8 by 66, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 66

Going ahead to step 2:
66 can be fit into 81 1 times, resulting in a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 66 from 81, we get 15.
Bring next digit (9) of the dividend behind the 15 and repeat the process: 159 / 66

Moving on to step 3:
The number 66 fits into 159 2 times, leaving a remainder of 27.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Subtracting 132 from 159 leaves us with 27.
Grab the next digit (8) from the dividend, add it to 27, then carry on: 278 / 66

On to step 4:
66 goes into 278 4 times with a remainder of 14.
Use 4 as the next digit of our solution. 
Result so far: 124.0
If we subtract 264 from 278, we get 14.
Grab the next digit (6) from the dividend, add it to 14, then carry on: 146 / 66

Going ahead to step 5:
66 can be fit into 146 2 times, resulting in a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 1242.0
Subtracting 132 from 146 leaves us with 14.
Grab the next digit (3) from the dividend, add it to 14, then carry on: 143 / 66

Going ahead to step 6:
The number 66 fits into 143 2 times, leaving a remainder of 11.
Record the quotient 2 as the next digit in the result. 
Result so far: 12422.0
Subtracting 132 from 143 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 7:
66 goes into 110 1 times with a remainder of 44.
Put 1 as the next digit of the answer. 
Result so far: 12422.1
Deduct 66 from 110 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 8:
66 can be fit into 440 6 times, resulting in a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 12422.16
The remainder is 44 after subtracting 396 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 9:
When dividing 440 by 66, we get 6 with a remainder of 44.
The next digit of our result is 6. 
Result so far: 12422.166
Deduct 396 from 440 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

The final outcome is 12422.166, with a leftover of 0.0044.