53351873 ÷ 863 
Our goal is to divide 53351873 by 863.

Moving on to step 1:
When dividing 5 by 863, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 863

Step 2:
53 divided by 863 is 0 with a remainder of 53.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 53 and we're left with 53.
Include the next digit (3) from the dividend after 53, then repeat: 533 / 863

Advancing to step 3:
The number 863 fits into 533 0 times, leaving a remainder of 533.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 533 leaves us with 533.
Include the next digit (5) from the dividend after 533, then repeat: 5335 / 863

Going ahead to step 4:
The number 863 fits into 5335 6 times, leaving a remainder of 157.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtract 5178 from 5335 to get 157.
Grab the next digit (1) from the dividend, add it to 157, then carry on: 1571 / 863

Let's proceed to step 5:
863 goes into 1571 1 times with a remainder of 708.
Record the quotient 1 as the next digit in the result. 
Result so far: 61.0
Subtract 863 from 1571 to get 708.
Include the next digit (8) from the dividend after 708, then repeat: 7088 / 863

Going ahead to step 6:
When dividing 7088 by 863, we get 8 with a remainder of 184.
The number 8 becomes the next digit in our result. 
Result so far: 618.0
If we subtract 6904 from 7088, we get 184.
Include the next digit (7) from the dividend after 184, then repeat: 1847 / 863

Moving on to step 7:
The number 863 fits into 1847 2 times, leaving a remainder of 121.
Record the quotient 2 as the next digit in the result. 
Result so far: 6182.0
Subtract 1726 from 1847 to get 121.
Take the next digit (3) from the dividend and append it to 121, then repeat: 1213 / 863

Step 8:
863 goes into 1213 1 times with a remainder of 350.
The number 1 becomes the next digit in our result. 
Result so far: 61821.0
The remainder is 350 after subtracting 863 from 1213.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Step 9:
863 goes into 3500 4 times with a remainder of 48.
Put 4 as the next digit of the answer. 
Result so far: 61821.4
If we take 3452 away from 3500, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 10:
863 can be fit into 480 0 times, resulting in a remainder of 480.
Use 0 as the next digit of our solution. 
Result so far: 61821.4
Subtract 0 from 480 to get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Going ahead to step 11:
863 goes into 4800 5 times with a remainder of 485.
Record the quotient 5 as the next digit in the result. 
Result so far: 61821.405
Subtracting 4315 from 4800 leaves us with 485.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4850, and continue the process.

Going ahead to step 12:
If we divide 4850 by 863, we get 5 and a remainder of 535.
Use 5 as the next digit of our solution. 
Result so far: 61821.4055
The remainder is 535 after subtracting 4315 from 4850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

The final result is 61821.4055 with a remainder of 0.00535.