We're dividing 66264501 by 387 
The aim is to understand the frequency of 387 in 66264501.

Moving on to step 1:
When dividing 6 by 387, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 387

Step 2:
387 goes into 66 0 times with a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Fetch the next digit (2) from the dividend, attach it to 66 and continue: 662 / 387

Going ahead to step 3:
387 can be fit into 662 1 times, resulting in a remainder of 275.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 387 from 662, we get 275.
Take the next digit (6) from the dividend and append it to 275, then repeat: 2756 / 387

Step 4:
If we divide 2756 by 387, we get 7 and a remainder of 47.
Put 7 as the next digit of the answer. 
Result so far: 17.0
If we subtract 2709 from 2756, we get 47.
Append the next digit (4) from the dividend to 47 and continue with: 474 / 387

Advancing to step 5:
If we divide 474 by 387, we get 1 and a remainder of 87.
The number 1 becomes the next digit in our result. 
Result so far: 171.0
Subtract 387 from 474 to get 87.
Append the next digit (5) from the dividend to 87 and continue with: 875 / 387

Let's proceed to step 6:
If we divide 875 by 387, we get 2 and a remainder of 101.
The next digit of our result is 2. 
Result so far: 1712.0
Subtracting 774 from 875 leaves us with 101.
Append the next digit (0) from the dividend to 101 and continue with: 1010 / 387

Step 7:
1010 divided by 387 is 2 with a remainder of 236.
The number 2 becomes the next digit in our result. 
Result so far: 17122.0
If we take 774 away from 1010, we end up with 236.
Append the next digit (1) from the dividend to 236 and continue with: 2361 / 387

Advancing to step 8:
2361 divided by 387 is 6 with a remainder of 39.
The number 6 becomes the next digit in our result. 
Result so far: 171226.0
If we subtract 2322 from 2361, we get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 9:
390 divided by 387 is 1 with a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 171226.1
Subtracting 387 from 390 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 10:
30 divided by 387 is 0 with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 171226.1
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 11:
When dividing 300 by 387, we get 0 with a remainder of 300.
Record the quotient 0 as the next digit in the result. 
Result so far: 171226.1
Deduct 0 from 300 and we're left with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

The final outcome is 171226.1, with a leftover of 0.03.