21599013 divided by 665 
The aim is to understand the frequency of 665 in 21599013.

Let's proceed to step 1:
When dividing 2 by 665, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 665

Going ahead to step 2:
If we divide 21 by 665, we get 0 and a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 665

Advancing to step 3:
When dividing 215 by 665, we get 0 with a remainder of 215.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 215 to get 215.
Bring next digit (9) of the dividend behind the 215 and repeat the process: 2159 / 665

Advancing to step 4:
2159 divided by 665 is 3 with a remainder of 164.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
The remainder is 164 after subtracting 1995 from 2159.
Include the next digit (9) from the dividend after 164, then repeat: 1649 / 665

Advancing to step 5:
The number 665 fits into 1649 2 times, leaving a remainder of 319.
Put 2 as the next digit of the answer. 
Result so far: 32.0
If we take 1330 away from 1649, we end up with 319.
Append the next digit (0) from the dividend to 319 and continue with: 3190 / 665

Moving on to step 6:
665 goes into 3190 4 times with a remainder of 530.
Write down 4 as next digit of the result. 
Result so far: 324.0
Subtract 2660 from 3190 to get 530.
Take the next digit (1) from the dividend and append it to 530, then repeat: 5301 / 665

On to step 7:
5301 divided by 665 is 7 with a remainder of 646.
Put 7 as the next digit of the answer. 
Result so far: 3247.0
Subtracting 4655 from 5301 leaves us with 646.
Fetch the next digit (3) from the dividend, attach it to 646 and continue: 6463 / 665

Step 8:
6463 divided by 665 is 9 with a remainder of 478.
The number 9 becomes the next digit in our result. 
Result so far: 32479.0
Subtracting 5985 from 6463 leaves us with 478.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Going ahead to step 9:
4780 divided by 665 is 7 with a remainder of 125.
Use 7 as the next digit of our solution. 
Result so far: 32479.7
If we subtract 4655 from 4780, we get 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Let's proceed to step 10:
665 can be fit into 1250 1 times, resulting in a remainder of 585.
The next digit of our result is 1. 
Result so far: 32479.71
Subtract 665 from 1250 to get 585.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5850, and continue the process.

Going ahead to step 11:
5850 divided by 665 is 8 with a remainder of 530.
Use 8 as the next digit of our solution. 
Result so far: 32479.718
If we take 5320 away from 5850, we end up with 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

Let's proceed to step 12:
If we divide 5300 by 665, we get 7 and a remainder of 645.
The next digit of our result is 7. 
Result so far: 32479.7187
Deduct 4655 from 5300 and we're left with 645.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6450, and continue the process.

Step 13:
When dividing 6450 by 665, we get 9 with a remainder of 465.
Write down 9 as next digit of the result. 
Result so far: 32479.71879
Subtract 5985 from 6450 to get 465.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

Moving on to step 14:
665 can be fit into 4650 6 times, resulting in a remainder of 660.
Put 6 as the next digit of the answer. 
Result so far: 32479.718796
Subtract 3990 from 4650 to get 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6600, and continue the process.

Going ahead to step 15:
6600 divided by 665 is 9 with a remainder of 615.
The next digit of our result is 9. 
Result so far: 32479.7187969
Subtract 5985 from 6600 to get 615.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6150, and continue the process.

Let's proceed to step 16:
When dividing 6150 by 665, we get 9 with a remainder of 165.
The next digit of our result is 9. 
Result so far: 32479.71879699
Subtracting 5985 from 6150 leaves us with 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

In conclusion, the division gives 32479.71879699 with a balance of 1.65e-07.