We look at the division of 69065778 by 66 
The aim is to understand the frequency of 66 in 69065778.

Step 1:
6 divided by 66 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (9) from the dividend after 6, then repeat: 69 / 66

Moving on to step 2:
The number 66 fits into 69 1 times, leaving a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 66 from 69, we get 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 66

Going ahead to step 3:
66 goes into 30 0 times with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtracting 0 from 30 leaves us with 30.
Bring next digit (6) of the dividend behind the 30 and repeat the process: 306 / 66

Step 4:
66 can be fit into 306 4 times, resulting in a remainder of 42.
Use 4 as the next digit of our solution. 
Result so far: 104.0
Subtract 264 from 306 to get 42.
Include the next digit (5) from the dividend after 42, then repeat: 425 / 66

Moving on to step 5:
425 divided by 66 is 6 with a remainder of 29.
The next digit of our result is 6. 
Result so far: 1046.0
The remainder is 29 after subtracting 396 from 425.
Include the next digit (7) from the dividend after 29, then repeat: 297 / 66

Moving on to step 6:
66 can be fit into 297 4 times, resulting in a remainder of 33.
The number 4 becomes the next digit in our result. 
Result so far: 10464.0
If we take 264 away from 297, we end up with 33.
Take the next digit (7) from the dividend and append it to 33, then repeat: 337 / 66

Advancing to step 7:
When dividing 337 by 66, we get 5 with a remainder of 7.
The next digit of our result is 5. 
Result so far: 104645.0
If we subtract 330 from 337, we get 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 66

Step 8:
If we divide 78 by 66, we get 1 and a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 1046451.0
Subtract 66 from 78 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 9:
When dividing 120 by 66, we get 1 with a remainder of 54.
Use 1 as the next digit of our solution. 
Result so far: 1046451.1
If we take 66 away from 120, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 10:
66 can be fit into 540 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 1046451.18
Deduct 528 from 540 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 11:
If we divide 120 by 66, we get 1 and a remainder of 54.
Put 1 as the next digit of the answer. 
Result so far: 1046451.181
Subtracting 66 from 120 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Going ahead to step 12:
540 divided by 66 is 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 1046451.1818
If we take 528 away from 540, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 13:
120 divided by 66 is 1 with a remainder of 54.
Use 1 as the next digit of our solution. 
Result so far: 1046451.18181
Subtract 66 from 120 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 14:
When dividing 540 by 66, we get 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 1046451.181818
If we subtract 528 from 540, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 15:
When dividing 120 by 66, we get 1 with a remainder of 54.
The next digit of our result is 1. 
Result so far: 1046451.1818181
The remainder is 54 after subtracting 66 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Let's proceed to step 16:
66 goes into 540 8 times with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 1046451.18181818
Subtract 528 from 540 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 1046451.18181818 and a remainder of 1.2e-08.