We look at the division of 593123 by 66 
The aim is to understand the frequency of 66 in 593123.

Going ahead to step 1:
66 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 66

On to step 2:
66 goes into 59 0 times with a remainder of 59.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 59, we get 59.
Bring next digit (3) of the dividend behind the 59 and repeat the process: 593 / 66

Moving on to step 3:
When dividing 593 by 66, we get 8 with a remainder of 65.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtract 528 from 593 to get 65.
Append the next digit (1) from the dividend to 65 and continue with: 651 / 66

Let's proceed to step 4:
When dividing 651 by 66, we get 9 with a remainder of 57.
Write down 9 as next digit of the result. 
Result so far: 89.0
Deduct 594 from 651 and we're left with 57.
Include the next digit (2) from the dividend after 57, then repeat: 572 / 66

Advancing to step 5:
If we divide 572 by 66, we get 8 and a remainder of 44.
Use 8 as the next digit of our solution. 
Result so far: 898.0
If we subtract 528 from 572, we get 44.
Include the next digit (3) from the dividend after 44, then repeat: 443 / 66

Let's proceed to step 6:
The number 66 fits into 443 6 times, leaving a remainder of 47.
Record the quotient 6 as the next digit in the result. 
Result so far: 8986.0
The remainder is 47 after subtracting 396 from 443.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 7:
When dividing 470 by 66, we get 7 with a remainder of 8.
Put 7 as the next digit of the answer. 
Result so far: 8986.7
If we take 462 away from 470, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 8:
If we divide 80 by 66, we get 1 and a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 8986.71
Deduct 66 from 80 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 9:
If we divide 140 by 66, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 8986.712
Subtract 132 from 140 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
The number 66 fits into 80 1 times, leaving a remainder of 14.
Use 1 as the next digit of our solution. 
Result so far: 8986.7121
If we subtract 66 from 80, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 11:
If we divide 140 by 66, we get 2 and a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 8986.71212
If we subtract 132 from 140, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 12:
If we divide 80 by 66, we get 1 and a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 8986.712121
The remainder is 14 after subtracting 66 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 13:
66 goes into 140 2 times with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 8986.7121212
Subtracting 132 from 140 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 14:
80 divided by 66 is 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 8986.71212121
Deduct 66 from 80 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 8986.71212121, with a leftover of 1.4e-08.