We look at the division of 66723371 by 404 
The aim is to understand the frequency of 404 in 66723371.

Let's proceed to step 1:
If we divide 6 by 404, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 404

Let's proceed to step 2:
66 divided by 404 is 0 with a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Append the next digit (7) from the dividend to 66 and continue with: 667 / 404

Advancing to step 3:
404 goes into 667 1 times with a remainder of 263.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 404 from 667, we get 263.
Take the next digit (2) from the dividend and append it to 263, then repeat: 2632 / 404

Step 4:
404 goes into 2632 6 times with a remainder of 208.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
If we subtract 2424 from 2632, we get 208.
Grab the next digit (3) from the dividend, add it to 208, then carry on: 2083 / 404

Going ahead to step 5:
2083 divided by 404 is 5 with a remainder of 63.
Record the quotient 5 as the next digit in the result. 
Result so far: 165.0
Subtract 2020 from 2083 to get 63.
Fetch the next digit (3) from the dividend, attach it to 63 and continue: 633 / 404

Let's proceed to step 6:
404 goes into 633 1 times with a remainder of 229.
Record the quotient 1 as the next digit in the result. 
Result so far: 1651.0
Subtract 404 from 633 to get 229.
Bring next digit (7) of the dividend behind the 229 and repeat the process: 2297 / 404

On to step 7:
404 goes into 2297 5 times with a remainder of 277.
Use 5 as the next digit of our solution. 
Result so far: 16515.0
Deduct 2020 from 2297 and we're left with 277.
Bring next digit (1) of the dividend behind the 277 and repeat the process: 2771 / 404

Step 8:
404 can be fit into 2771 6 times, resulting in a remainder of 347.
Write down 6 as next digit of the result. 
Result so far: 165156.0
If we subtract 2424 from 2771, we get 347.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3470, and continue the process.

Moving on to step 9:
The number 404 fits into 3470 8 times, leaving a remainder of 238.
The number 8 becomes the next digit in our result. 
Result so far: 165156.8
Subtract 3232 from 3470 to get 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

Let's proceed to step 10:
If we divide 2380 by 404, we get 5 and a remainder of 360.
Put 5 as the next digit of the answer. 
Result so far: 165156.85
The remainder is 360 after subtracting 2020 from 2380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

On to step 11:
3600 divided by 404 is 8 with a remainder of 368.
Put 8 as the next digit of the answer. 
Result so far: 165156.858
Deduct 3232 from 3600 and we're left with 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

Advancing to step 12:
When dividing 3680 by 404, we get 9 with a remainder of 44.
Record the quotient 9 as the next digit in the result. 
Result so far: 165156.8589
If we take 3636 away from 3680, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 13:
When dividing 440 by 404, we get 1 with a remainder of 36.
Put 1 as the next digit of the answer. 
Result so far: 165156.85891
If we take 404 away from 440, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 14:
404 can be fit into 360 0 times, resulting in a remainder of 360.
Write down 0 as next digit of the result. 
Result so far: 165156.85891
Subtract 0 from 360 to get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Advancing to step 15:
3600 divided by 404 is 8 with a remainder of 368.
Record the quotient 8 as the next digit in the result. 
Result so far: 165156.8589108
The remainder is 368 after subtracting 3232 from 3600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

Advancing to step 16:
3680 divided by 404 is 9 with a remainder of 44.
Put 9 as the next digit of the answer. 
Result so far: 165156.85891089
Deduct 3636 from 3680 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

The final outcome is 165156.85891089, with a leftover of 4.4e-08.