We look at the division of 80601369 by 521 
Let's see how many times 521 fits into 80601369.

Going ahead to step 1:
If we divide 8 by 521, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 521

Moving on to step 2:
The number 521 fits into 80 0 times, leaving a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 80, we end up with 80.
Append the next digit (6) from the dividend to 80 and continue with: 806 / 521

Moving on to step 3:
The number 521 fits into 806 1 times, leaving a remainder of 285.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 521 from 806 to get 285.
Bring next digit (0) of the dividend behind the 285 and repeat the process: 2850 / 521

Moving on to step 4:
521 goes into 2850 5 times with a remainder of 245.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Subtract 2605 from 2850 to get 245.
Grab the next digit (1) from the dividend, add it to 245, then carry on: 2451 / 521

Going ahead to step 5:
521 can be fit into 2451 4 times, resulting in a remainder of 367.
Use 4 as the next digit of our solution. 
Result so far: 154.0
The remainder is 367 after subtracting 2084 from 2451.
Include the next digit (3) from the dividend after 367, then repeat: 3673 / 521

Moving on to step 6:
If we divide 3673 by 521, we get 7 and a remainder of 26.
Put 7 as the next digit of the answer. 
Result so far: 1547.0
Subtract 3647 from 3673 to get 26.
Take the next digit (6) from the dividend and append it to 26, then repeat: 266 / 521

Let's proceed to step 7:
521 can be fit into 266 0 times, resulting in a remainder of 266.
The number 0 becomes the next digit in our result. 
Result so far: 15470.0
Subtract 0 from 266 to get 266.
Grab the next digit (9) from the dividend, add it to 266, then carry on: 2669 / 521

Step 8:
The number 521 fits into 2669 5 times, leaving a remainder of 64.
Record the quotient 5 as the next digit in the result. 
Result so far: 154705.0
If we take 2605 away from 2669, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 9:
When dividing 640 by 521, we get 1 with a remainder of 119.
Record the quotient 1 as the next digit in the result. 
Result so far: 154705.1
If we take 521 away from 640, we end up with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Going ahead to step 10:
521 goes into 1190 2 times with a remainder of 148.
The number 2 becomes the next digit in our result. 
Result so far: 154705.12
Subtracting 1042 from 1190 leaves us with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Step 11:
1480 divided by 521 is 2 with a remainder of 438.
Use 2 as the next digit of our solution. 
Result so far: 154705.122
If we take 1042 away from 1480, we end up with 438.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4380, and continue the process.

The final outcome is 154705.122, with a leftover of 0.0438.