Let's divide 81665075 by 161
The aim is to understand the frequency of 161 in 81665075.

Going ahead to step 1:
8 divided by 161 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 161

On to step 2:
161 can be fit into 81 0 times, resulting in a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Fetch the next digit (6) from the dividend, attach it to 81 and continue: 816 / 161

On to step 3:
161 can be fit into 816 5 times, resulting in a remainder of 11.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we take 805 away from 816, we end up with 11.
Bring next digit (6) of the dividend behind the 11 and repeat the process: 116 / 161

On to step 4:
161 goes into 116 0 times with a remainder of 116.
Write down 0 as next digit of the result. 
Result so far: 50.0
If we subtract 0 from 116, we get 116.
Grab the next digit (5) from the dividend, add it to 116, then carry on: 1165 / 161

Advancing to step 5:
1165 divided by 161 is 7 with a remainder of 38.
Use 7 as the next digit of our solution. 
Result so far: 507.0
The remainder is 38 after subtracting 1127 from 1165.
Bring next digit (0) of the dividend behind the 38 and repeat the process: 380 / 161

On to step 6:
161 can be fit into 380 2 times, resulting in a remainder of 58.
Record the quotient 2 as the next digit in the result. 
Result so far: 5072.0
Subtract 322 from 380 to get 58.
Grab the next digit (7) from the dividend, add it to 58, then carry on: 587 / 161

Advancing to step 7:
When dividing 587 by 161, we get 3 with a remainder of 104.
Write down 3 as next digit of the result. 
Result so far: 50723.0
The remainder is 104 after subtracting 483 from 587.
Fetch the next digit (5) from the dividend, attach it to 104 and continue: 1045 / 161

Advancing to step 8:
When dividing 1045 by 161, we get 6 with a remainder of 79.
The number 6 becomes the next digit in our result. 
Result so far: 507236.0
Subtracting 966 from 1045 leaves us with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Let's proceed to step 9:
If we divide 790 by 161, we get 4 and a remainder of 146.
The number 4 becomes the next digit in our result. 
Result so far: 507236.4
Deduct 644 from 790 and we're left with 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

On to step 10:
When dividing 1460 by 161, we get 9 with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 507236.49
Subtracting 1449 from 1460 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 11:
110 divided by 161 is 0 with a remainder of 110.
The number 0 becomes the next digit in our result. 
Result so far: 507236.49
Deduct 0 from 110 and we're left 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.

Step 12:
1100 divided by 161 is 6 with a remainder of 134.
The number 6 becomes the next digit in our result. 
Result so far: 507236.4906
If we subtract 966 from 1100, we get 134.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

Step 13:
1340 divided by 161 is 8 with a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 507236.49068
Deduct 1288 from 1340 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 14:
161 can be fit into 520 3 times, resulting in a remainder of 37.
Put 3 as the next digit of the answer. 
Result so far: 507236.490683
If we subtract 483 from 520, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Advancing to step 15:
The number 161 fits into 370 2 times, leaving a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 507236.4906832
If we subtract 322 from 370, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 16:
When dividing 480 by 161, we get 2 with a remainder of 158.
The number 2 becomes the next digit in our result. 
Result so far: 507236.49068322
If we subtract 322 from 480, we get 158.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1580, and continue the process.

The quotient of the division is 507236.49068322, and the remainder is 1.58e-07.