66516030 ÷ 170 
We want to figure out the number of times 66516030 can be divided by 170.

Let's proceed to step 1:
When dividing 6 by 170, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 170

On to step 2:
The number 170 fits into 66 0 times, leaving a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Fetch the next digit (5) from the dividend, attach it to 66 and continue: 665 / 170

Moving on to step 3:
665 divided by 170 is 3 with a remainder of 155.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 510 from 665, we get 155.
Append the next digit (1) from the dividend to 155 and continue with: 1551 / 170

Moving on to step 4:
When dividing 1551 by 170, we get 9 with a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 39.0
If we subtract 1530 from 1551, we get 21.
Take the next digit (6) from the dividend and append it to 21, then repeat: 216 / 170

Moving on to step 5:
The number 170 fits into 216 1 times, leaving a remainder of 46.
Put 1 as the next digit of the answer. 
Result so far: 391.0
Deduct 170 from 216 and we're left with 46.
Take the next digit (0) from the dividend and append it to 46, then repeat: 460 / 170

Going ahead to step 6:
460 divided by 170 is 2 with a remainder of 120.
Record the quotient 2 as the next digit in the result. 
Result so far: 3912.0
The remainder is 120 after subtracting 340 from 460.
Grab the next digit (3) from the dividend, add it to 120, then carry on: 1203 / 170

Step 7:
170 goes into 1203 7 times with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 39127.0
Subtract 1190 from 1203 to get 13.
Grab the next digit (0) from the dividend, add it to 13, then carry on: 130 / 170

Moving on to step 8:
130 divided by 170 is 0 with a remainder of 130.
Write down 0 as next digit of the result. 
Result so far: 391270.0
Deduct 0 from 130 and we're left with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Advancing to step 9:
170 can be fit into 1300 7 times, resulting in a remainder of 110.
Put 7 as the next digit of the answer. 
Result so far: 391270.7
If we take 1190 away from 1300, we end up with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Going ahead to step 10:
170 goes into 1100 6 times with a remainder of 80.
The next digit of our result is 6. 
Result so far: 391270.76
If we take 1020 away from 1100, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 11:
170 can be fit into 800 4 times, resulting in a remainder of 120.
Put 4 as the next digit of the answer. 
Result so far: 391270.764
Deduct 680 from 800 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 12:
170 goes into 1200 7 times with a remainder of 10.
Put 7 as the next digit of the answer. 
Result so far: 391270.7647
If we take 1190 away from 1200, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 13:
170 can be fit into 100 0 times, resulting in a remainder of 100.
The next digit of our result is 0. 
Result so far: 391270.7647
If we take 0 away from 100, we end up with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 14:
170 goes into 1000 5 times with a remainder of 150.
Put 5 as the next digit of the answer. 
Result so far: 391270.764705
The remainder is 150 after subtracting 850 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Let's proceed to step 15:
If we divide 1500 by 170, we get 8 and a remainder of 140.
Record the quotient 8 as the next digit in the result. 
Result so far: 391270.7647058
Subtract 1360 from 1500 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 16:
When dividing 1400 by 170, we get 8 with a remainder of 40.
Use 8 as the next digit of our solution. 
Result so far: 391270.76470588
If we take 1360 away from 1400, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 391270.76470588, with a leftover of 4e-08.