We're dividing 16593653 by 666 
The aim is to understand the frequency of 666 in 16593653.

Step 1:
The number 666 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (6) from the dividend to 1 and continue with: 16 / 666

On to step 2:
666 goes into 16 0 times with a remainder of 16.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 16, we end up with 16.
Fetch the next digit (5) from the dividend, attach it to 16 and continue: 165 / 666

On to step 3:
666 goes into 165 0 times with a remainder of 165.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 165 after subtracting 0 from 165.
Bring next digit (9) of the dividend behind the 165 and repeat the process: 1659 / 666

Moving on to step 4:
If we divide 1659 by 666, we get 2 and a remainder of 327.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 1332 from 1659, we get 327.
Fetch the next digit (3) from the dividend, attach it to 327 and continue: 3273 / 666

Let's proceed to step 5:
When dividing 3273 by 666, we get 4 with a remainder of 609.
Record the quotient 4 as the next digit in the result. 
Result so far: 24.0
If we subtract 2664 from 3273, we get 609.
Bring next digit (6) of the dividend behind the 609 and repeat the process: 6096 / 666

Let's proceed to step 6:
6096 divided by 666 is 9 with a remainder of 102.
Use 9 as the next digit of our solution. 
Result so far: 249.0
Subtract 5994 from 6096 to get 102.
Fetch the next digit (5) from the dividend, attach it to 102 and continue: 1025 / 666

Advancing to step 7:
1025 divided by 666 is 1 with a remainder of 359.
Record the quotient 1 as the next digit in the result. 
Result so far: 2491.0
Subtracting 666 from 1025 leaves us with 359.
Bring next digit (3) of the dividend behind the 359 and repeat the process: 3593 / 666

Moving on to step 8:
When dividing 3593 by 666, we get 5 with a remainder of 263.
Use 5 as the next digit of our solution. 
Result so far: 24915.0
If we subtract 3330 from 3593, we get 263.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2630, and continue the process.

Step 9:
2630 divided by 666 is 3 with a remainder of 632.
The next digit of our result is 3. 
Result so far: 24915.3
If we take 1998 away from 2630, we end up with 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

Moving on to step 10:
6320 divided by 666 is 9 with a remainder of 326.
The number 9 becomes the next digit in our result. 
Result so far: 24915.39
Deduct 5994 from 6320 and we're left with 326.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3260, and continue the process.

Moving on to step 11:
The number 666 fits into 3260 4 times, leaving a remainder of 596.
Use 4 as the next digit of our solution. 
Result so far: 24915.394
If we subtract 2664 from 3260, we get 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Step 12:
666 can be fit into 5960 8 times, resulting in a remainder of 632.
The number 8 becomes the next digit in our result. 
Result so far: 24915.3948
Deduct 5328 from 5960 and we're left with 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

Step 13:
If we divide 6320 by 666, we get 9 and a remainder of 326.
The next digit of our result is 9. 
Result so far: 24915.39489
Deduct 5994 from 6320 and we're left with 326.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3260, and continue the process.

Going ahead to step 14:
3260 divided by 666 is 4 with a remainder of 596.
The next digit of our result is 4. 
Result so far: 24915.394894
Subtract 2664 from 3260 to get 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Advancing to step 15:
666 goes into 5960 8 times with a remainder of 632.
Use 8 as the next digit of our solution. 
Result so far: 24915.3948948
If we subtract 5328 from 5960, we get 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

Let's proceed to step 16:
When dividing 6320 by 666, we get 9 with a remainder of 326.
Record the quotient 9 as the next digit in the result. 
Result so far: 24915.39489489
The remainder is 326 after subtracting 5994 from 6320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3260, and continue the process.

Our division results in 24915.39489489 with a remaining 3.26e-07.