66071375 ÷ 721 
Our goal is to divide 66071375 by 721.

Step 1:
721 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 721

Moving on to step 2:
721 can be fit into 66 0 times, resulting in a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Append the next digit (0) from the dividend to 66 and continue with: 660 / 721

On to step 3:
721 can be fit into 660 0 times, resulting in a remainder of 660.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 660, we end up with 660.
Take the next digit (7) from the dividend and append it to 660, then repeat: 6607 / 721

Step 4:
721 goes into 6607 9 times with a remainder of 118.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we take 6489 away from 6607, we end up with 118.
Include the next digit (1) from the dividend after 118, then repeat: 1181 / 721

Moving on to step 5:
1181 divided by 721 is 1 with a remainder of 460.
The number 1 becomes the next digit in our result. 
Result so far: 91.0
Subtract 721 from 1181 to get 460.
Bring next digit (3) of the dividend behind the 460 and repeat the process: 4603 / 721

Step 6:
When dividing 4603 by 721, we get 6 with a remainder of 277.
The number 6 becomes the next digit in our result. 
Result so far: 916.0
Subtract 4326 from 4603 to get 277.
Include the next digit (7) from the dividend after 277, then repeat: 2777 / 721

Step 7:
721 can be fit into 2777 3 times, resulting in a remainder of 614.
Put 3 as the next digit of the answer. 
Result so far: 9163.0
Deduct 2163 from 2777 and we're left with 614.
Bring next digit (5) of the dividend behind the 614 and repeat the process: 6145 / 721

Let's proceed to step 8:
The number 721 fits into 6145 8 times, leaving a remainder of 377.
Use 8 as the next digit of our solution. 
Result so far: 91638.0
If we take 5768 away from 6145, we end up with 377.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3770, and continue the process.

On to step 9:
721 can be fit into 3770 5 times, resulting in a remainder of 165.
The next digit of our result is 5. 
Result so far: 91638.5
Subtract 3605 from 3770 to get 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Going ahead to step 10:
1650 divided by 721 is 2 with a remainder of 208.
Use 2 as the next digit of our solution. 
Result so far: 91638.52
If we take 1442 away from 1650, we end up with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Going ahead to step 11:
721 goes into 2080 2 times with a remainder of 638.
The number 2 becomes the next digit in our result. 
Result so far: 91638.522
If we take 1442 away from 2080, we end up with 638.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6380, and continue the process.

Our division results in 91638.522 with a remaining 0.0638.