404573 divided by 66 
The aim is to understand the frequency of 66 in 404573.

Moving on to step 1:
When dividing 4 by 66, we get 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 66

Step 2:
40 divided by 66 is 0 with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 40 after subtracting 0 from 40.
Bring next digit (4) of the dividend behind the 40 and repeat the process: 404 / 66

On to step 3:
When dividing 404 by 66, we get 6 with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Deduct 396 from 404 and we're left with 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 66

Advancing to step 4:
66 can be fit into 85 1 times, resulting in a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 61.0
If we subtract 66 from 85, we get 19.
Fetch the next digit (7) from the dividend, attach it to 19 and continue: 197 / 66

Going ahead to step 5:
66 can be fit into 197 2 times, resulting in a remainder of 65.
The number 2 becomes the next digit in our result. 
Result so far: 612.0
Deduct 132 from 197 and we're left with 65.
Take the next digit (3) from the dividend and append it to 65, then repeat: 653 / 66

Step 6:
If we divide 653 by 66, we get 9 and a remainder of 59.
Write down 9 as next digit of the result. 
Result so far: 6129.0
If we take 594 away from 653, we end up with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Step 7:
590 divided by 66 is 8 with a remainder of 62.
Write down 8 as next digit of the result. 
Result so far: 6129.8
The remainder is 62 after subtracting 528 from 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Going ahead to step 8:
66 goes into 620 9 times with a remainder of 26.
Record the quotient 9 as the next digit in the result. 
Result so far: 6129.89
Deduct 594 from 620 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 9:
260 divided by 66 is 3 with a remainder of 62.
Record the quotient 3 as the next digit in the result. 
Result so far: 6129.893
Deduct 198 from 260 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Going ahead to step 10:
66 goes into 620 9 times with a remainder of 26.
Record the quotient 9 as the next digit in the result. 
Result so far: 6129.8939
If we subtract 594 from 620, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 11:
66 goes into 260 3 times with a remainder of 62.
The next digit of our result is 3. 
Result so far: 6129.89393
The remainder is 62 after subtracting 198 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Going ahead to step 12:
66 can be fit into 620 9 times, resulting in a remainder of 26.
Write down 9 as next digit of the result. 
Result so far: 6129.893939
Subtracting 594 from 620 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 13:
66 can be fit into 260 3 times, resulting in a remainder of 62.
Put 3 as the next digit of the answer. 
Result so far: 6129.8939393
If we subtract 198 from 260, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Let's proceed to step 14:
66 goes into 620 9 times with a remainder of 26.
The number 9 becomes the next digit in our result. 
Result so far: 6129.89393939
Deduct 594 from 620 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

The quotient of the division is 6129.89393939, and the remainder is 2.6e-08.