873587 divided by 66 
The aim is to understand the frequency of 66 in 873587.

Let's proceed to step 1:
8 divided by 66 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 66

On to step 2:
When dividing 87 by 66, we get 1 with a remainder of 21.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 66 from 87 and we're left with 21.
Append the next digit (3) from the dividend to 21 and continue with: 213 / 66

On to step 3:
213 divided by 66 is 3 with a remainder of 15.
Put 3 as the next digit of the answer. 
Result so far: 13.0
Subtracting 198 from 213 leaves us with 15.
Include the next digit (5) from the dividend after 15, then repeat: 155 / 66

On to step 4:
When dividing 155 by 66, we get 2 with a remainder of 23.
The next digit of our result is 2. 
Result so far: 132.0
If we subtract 132 from 155, we get 23.
Grab the next digit (8) from the dividend, add it to 23, then carry on: 238 / 66

Step 5:
66 can be fit into 238 3 times, resulting in a remainder of 40.
Put 3 as the next digit of the answer. 
Result so far: 1323.0
Subtract 198 from 238 to get 40.
Grab the next digit (7) from the dividend, add it to 40, then carry on: 407 / 66

Step 6:
The number 66 fits into 407 6 times, leaving a remainder of 11.
Record the quotient 6 as the next digit in the result. 
Result so far: 13236.0
If we subtract 396 from 407, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
The number 66 fits into 110 1 times, leaving a remainder of 44.
Write down 1 as next digit of the result. 
Result so far: 13236.1
If we subtract 66 from 110, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 8:
The number 66 fits into 440 6 times, leaving a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 13236.16
The remainder is 44 after subtracting 396 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Going ahead to step 9:
66 goes into 440 6 times with a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 13236.166
Subtract 396 from 440 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

In conclusion, the division gives 13236.166 with a balance of 0.0044.