81570541 divided by 243 
We want to figure out the number of times 81570541 can be divided by 243.

Step 1:
The number 243 fits into 8 0 times, leaving 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 (1) from the dividend and append it to 8, then repeat: 81 / 243

Advancing to step 2:
81 divided by 243 is 0 with a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Include the next digit (5) from the dividend after 81, then repeat: 815 / 243

Advancing to step 3:
243 can be fit into 815 3 times, resulting in a remainder of 86.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 729 from 815, we get 86.
Include the next digit (7) from the dividend after 86, then repeat: 867 / 243

Step 4:
The number 243 fits into 867 3 times, leaving a remainder of 138.
Write down 3 as next digit of the result. 
Result so far: 33.0
If we take 729 away from 867, we end up with 138.
Append the next digit (0) from the dividend to 138 and continue with: 1380 / 243

Let's proceed to step 5:
If we divide 1380 by 243, we get 5 and a remainder of 165.
Use 5 as the next digit of our solution. 
Result so far: 335.0
If we take 1215 away from 1380, we end up with 165.
Take the next digit (5) from the dividend and append it to 165, then repeat: 1655 / 243

Advancing to step 6:
243 goes into 1655 6 times with a remainder of 197.
Record the quotient 6 as the next digit in the result. 
Result so far: 3356.0
Subtracting 1458 from 1655 leaves us with 197.
Grab the next digit (4) from the dividend, add it to 197, then carry on: 1974 / 243

Moving on to step 7:
When dividing 1974 by 243, we get 8 with a remainder of 30.
The number 8 becomes the next digit in our result. 
Result so far: 33568.0
If we take 1944 away from 1974, we end up with 30.
Take the next digit (1) from the dividend and append it to 30, then repeat: 301 / 243

Let's proceed to step 8:
When dividing 301 by 243, we get 1 with a remainder of 58.
The next digit of our result is 1. 
Result so far: 335681.0
Deduct 243 from 301 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 9:
243 can be fit into 580 2 times, resulting in a remainder of 94.
The next digit of our result is 2. 
Result so far: 335681.2
Deduct 486 from 580 and we're left with 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Advancing to step 10:
When dividing 940 by 243, we get 3 with a remainder of 211.
Use 3 as the next digit of our solution. 
Result so far: 335681.23
Deduct 729 from 940 and we're left with 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Moving on to step 11:
243 can be fit into 2110 8 times, resulting in a remainder of 166.
Write down 8 as next digit of the result. 
Result so far: 335681.238
Subtract 1944 from 2110 to get 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Moving on to step 12:
243 goes into 1660 6 times with a remainder of 202.
Write down 6 as next digit of the result. 
Result so far: 335681.2386
Deduct 1458 from 1660 and we're left with 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

On to step 13:
When dividing 2020 by 243, we get 8 with a remainder of 76.
Record the quotient 8 as the next digit in the result. 
Result so far: 335681.23868
Subtract 1944 from 2020 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 14:
The number 243 fits into 760 3 times, leaving a remainder of 31.
Put 3 as the next digit of the answer. 
Result so far: 335681.238683
Deduct 729 from 760 and we're left with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 15:
The number 243 fits into 310 1 times, leaving a remainder of 67.
The next digit of our result is 1. 
Result so far: 335681.2386831
The remainder is 67 after subtracting 243 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 16:
When dividing 670 by 243, we get 2 with a remainder of 184.
The next digit of our result is 2. 
Result so far: 335681.23868312
Deduct 486 from 670 and we're left with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

In conclusion, the division gives 335681.23868312 with a balance of 1.84e-07.