66401340 ÷ 521 
Let's see how many times 521 fits into 66401340.

Moving on to step 1:
521 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 521

Step 2:
521 goes into 66 0 times with a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Take the next digit (4) from the dividend and append it to 66, then repeat: 664 / 521

On to step 3:
521 goes into 664 1 times with a remainder of 143.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 143 after subtracting 521 from 664.
Append the next digit (0) from the dividend to 143 and continue with: 1430 / 521

Step 4:
If we divide 1430 by 521, we get 2 and a remainder of 388.
The next digit of our result is 2. 
Result so far: 12.0
If we take 1042 away from 1430, we end up with 388.
Bring next digit (1) of the dividend behind the 388 and repeat the process: 3881 / 521

Moving on to step 5:
3881 divided by 521 is 7 with a remainder of 234.
The number 7 becomes the next digit in our result. 
Result so far: 127.0
Subtract 3647 from 3881 to get 234.
Fetch the next digit (3) from the dividend, attach it to 234 and continue: 2343 / 521

Going ahead to step 6:
If we divide 2343 by 521, we get 4 and a remainder of 259.
Write down 4 as next digit of the result. 
Result so far: 1274.0
The remainder is 259 after subtracting 2084 from 2343.
Grab the next digit (4) from the dividend, add it to 259, then carry on: 2594 / 521

Step 7:
2594 divided by 521 is 4 with a remainder of 510.
The number 4 becomes the next digit in our result. 
Result so far: 12744.0
If we take 2084 away from 2594, we end up with 510.
Grab the next digit (0) from the dividend, add it to 510, then carry on: 5100 / 521

Going ahead to step 8:
If we divide 5100 by 521, we get 9 and a remainder of 411.
Use 9 as the next digit of our solution. 
Result so far: 127449.0
Subtracting 4689 from 5100 leaves us with 411.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4110, and continue the process.

Step 9:
521 goes into 4110 7 times with a remainder of 463.
Use 7 as the next digit of our solution. 
Result so far: 127449.7
If we take 3647 away from 4110, we end up with 463.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4630, and continue the process.

Going ahead to step 10:
4630 divided by 521 is 8 with a remainder of 462.
Record the quotient 8 as the next digit in the result. 
Result so far: 127449.78
Subtracting 4168 from 4630 leaves us with 462.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

Let's proceed to step 11:
When dividing 4620 by 521, we get 8 with a remainder of 452.
Put 8 as the next digit of the answer. 
Result so far: 127449.788
Subtract 4168 from 4620 to get 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

The final outcome is 127449.788, with a leftover of 0.0452.