66784205 ÷ 391 
Let's see how many times 391 fits into 66784205.

Let's proceed to step 1:
391 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 391

Step 2:
66 divided by 391 is 0 with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Fetch the next digit (7) from the dividend, attach it to 66 and continue: 667 / 391

Step 3:
391 can be fit into 667 1 times, resulting in a remainder of 276.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 391 from 667, we get 276.
Bring next digit (8) of the dividend behind the 276 and repeat the process: 2768 / 391

Going ahead to step 4:
If we divide 2768 by 391, we get 7 and a remainder of 31.
Write down 7 as next digit of the result. 
Result so far: 17.0
Deduct 2737 from 2768 and we're left with 31.
Bring next digit (4) of the dividend behind the 31 and repeat the process: 314 / 391

Moving on to step 5:
391 can be fit into 314 0 times, resulting in a remainder of 314.
Use 0 as the next digit of our solution. 
Result so far: 170.0
Subtract 0 from 314 to get 314.
Bring next digit (2) of the dividend behind the 314 and repeat the process: 3142 / 391

Moving on to step 6:
When dividing 3142 by 391, we get 8 with a remainder of 14.
Record the quotient 8 as the next digit in the result. 
Result so far: 1708.0
If we take 3128 away from 3142, we end up with 14.
Include the next digit (0) from the dividend after 14, then repeat: 140 / 391

On to step 7:
If we divide 140 by 391, we get 0 and a remainder of 140.
The number 0 becomes the next digit in our result. 
Result so far: 17080.0
Subtract 0 from 140 to get 140.
Bring next digit (5) of the dividend behind the 140 and repeat the process: 1405 / 391

Going ahead to step 8:
The number 391 fits into 1405 3 times, leaving a remainder of 232.
The number 3 becomes the next digit in our result. 
Result so far: 170803.0
Deduct 1173 from 1405 and we're left with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

On to step 9:
If we divide 2320 by 391, we get 5 and a remainder of 365.
Write down 5 as next digit of the result. 
Result so far: 170803.5
If we subtract 1955 from 2320, we get 365.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3650, and continue the process.

On to step 10:
391 goes into 3650 9 times with a remainder of 131.
Write down 9 as next digit of the result. 
Result so far: 170803.59
Subtract 3519 from 3650 to get 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Let's proceed to step 11:
If we divide 1310 by 391, we get 3 and a remainder of 137.
The number 3 becomes the next digit in our result. 
Result so far: 170803.593
Subtract 1173 from 1310 to get 137.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1370, and continue the process.

Advancing to step 12:
If we divide 1370 by 391, we get 3 and a remainder of 197.
The next digit of our result is 3. 
Result so far: 170803.5933
If we take 1173 away from 1370, we end up with 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

After the division, we end up with 170803.5933 and a remainder of 0.00197.