10519547 ÷ 166 
The aim is to understand the frequency of 166 in 10519547.

Let's proceed to step 1:
When dividing 1 by 166, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 166

Going ahead to step 2:
10 divided by 166 is 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 10 leaves us with 10.
Include the next digit (5) from the dividend after 10, then repeat: 105 / 166

Moving on to step 3:
If we divide 105 by 166, we get 0 and a remainder of 105.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 105 after subtracting 0 from 105.
Take the next digit (1) from the dividend and append it to 105, then repeat: 1051 / 166

Let's proceed to step 4:
166 can be fit into 1051 6 times, resulting in a remainder of 55.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtracting 996 from 1051 leaves us with 55.
Include the next digit (9) from the dividend after 55, then repeat: 559 / 166

Going ahead to step 5:
166 goes into 559 3 times with a remainder of 61.
Write down 3 as next digit of the result. 
Result so far: 63.0
Subtract 498 from 559 to get 61.
Fetch the next digit (5) from the dividend, attach it to 61 and continue: 615 / 166

Let's proceed to step 6:
The number 166 fits into 615 3 times, leaving a remainder of 117.
The next digit of our result is 3. 
Result so far: 633.0
The remainder is 117 after subtracting 498 from 615.
Bring next digit (4) of the dividend behind the 117 and repeat the process: 1174 / 166

Going ahead to step 7:
166 goes into 1174 7 times with a remainder of 12.
The next digit of our result is 7. 
Result so far: 6337.0
Deduct 1162 from 1174 and we're left with 12.
Grab the next digit (7) from the dividend, add it to 12, then carry on: 127 / 166

Going ahead to step 8:
The number 166 fits into 127 0 times, leaving a remainder of 127.
The number 0 becomes the next digit in our result. 
Result so far: 63370.0
Deduct 0 from 127 and we're left with 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Let's proceed to step 9:
When dividing 1270 by 166, we get 7 with a remainder of 108.
Write down 7 as next digit of the result. 
Result so far: 63370.7
The remainder is 108 after subtracting 1162 from 1270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Moving on to step 10:
166 can be fit into 1080 6 times, resulting in a remainder of 84.
Put 6 as the next digit of the answer. 
Result so far: 63370.76
Deduct 996 from 1080 and we're left with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Going ahead to step 11:
166 goes into 840 5 times with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 63370.765
Deduct 830 from 840 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 12:
166 can be fit into 100 0 times, resulting in a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 63370.765
If we subtract 0 from 100, we get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Going ahead to step 13:
1000 divided by 166 is 6 with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 63370.76506
If we subtract 996 from 1000, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 14:
40 divided by 166 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 63370.76506
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 15:
166 goes into 400 2 times with a remainder of 68.
Use 2 as the next digit of our solution. 
Result so far: 63370.7650602
Deduct 332 from 400 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Going ahead to step 16:
166 goes into 680 4 times with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 63370.76506024
The remainder is 16 after subtracting 664 from 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final outcome is 63370.76506024, with a leftover of 1.6e-08.