We look at the division of 86667999 by 173 
The aim is to understand the frequency of 173 in 86667999.

Advancing to step 1:
When dividing 8 by 173, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 173

Going ahead to step 2:
173 goes into 86 0 times with a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Append the next digit (6) from the dividend to 86 and continue with: 866 / 173

On to step 3:
866 divided by 173 is 5 with a remainder of 1.
The next digit of our result is 5. 
Result so far: 5.0
The remainder is 1 after subtracting 865 from 866.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 173

Going ahead to step 4:
173 can be fit into 16 0 times, resulting in a remainder of 16.
The next digit of our result is 0. 
Result so far: 50.0
Subtract 0 from 16 to get 16.
Take the next digit (7) from the dividend and append it to 16, then repeat: 167 / 173

Moving on to step 5:
If we divide 167 by 173, we get 0 and a remainder of 167.
Put 0 as the next digit of the answer. 
Result so far: 500.0
Subtract 0 from 167 to get 167.
Take the next digit (9) from the dividend and append it to 167, then repeat: 1679 / 173

Step 6:
If we divide 1679 by 173, we get 9 and a remainder of 122.
Put 9 as the next digit of the answer. 
Result so far: 5009.0
The remainder is 122 after subtracting 1557 from 1679.
Bring next digit (9) of the dividend behind the 122 and repeat the process: 1229 / 173

Going ahead to step 7:
When dividing 1229 by 173, we get 7 with a remainder of 18.
Record the quotient 7 as the next digit in the result. 
Result so far: 50097.0
If we subtract 1211 from 1229, we get 18.
Take the next digit (9) from the dividend and append it to 18, then repeat: 189 / 173

Let's proceed to step 8:
189 divided by 173 is 1 with a remainder of 16.
Record the quotient 1 as the next digit in the result. 
Result so far: 500971.0
If we subtract 173 from 189, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 9:
173 goes into 160 0 times with a remainder of 160.
The number 0 becomes the next digit in our result. 
Result so far: 500971.0
If we take 0 away from 160, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

On to step 10:
173 can be fit into 1600 9 times, resulting in a remainder of 43.
The number 9 becomes the next digit in our result. 
Result so far: 500971.09
Subtracting 1557 from 1600 leaves us with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 11:
The number 173 fits into 430 2 times, leaving a remainder of 84.
The number 2 becomes the next digit in our result. 
Result so far: 500971.092
Deduct 346 from 430 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.

On to step 12:
173 goes into 840 4 times with a remainder of 148.
The next digit of our result is 4. 
Result so far: 500971.0924
The remainder is 148 after subtracting 692 from 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Moving on to step 13:
173 goes into 1480 8 times with a remainder of 96.
Record the quotient 8 as the next digit in the result. 
Result so far: 500971.09248
Deduct 1384 from 1480 and we're left with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

On to step 14:
The number 173 fits into 960 5 times, leaving a remainder of 95.
The next digit of our result is 5. 
Result so far: 500971.092485
The remainder is 95 after subtracting 865 from 960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Step 15:
173 can be fit into 950 5 times, resulting in a remainder of 85.
Use 5 as the next digit of our solution. 
Result so far: 500971.0924855
Deduct 865 from 950 and we're left with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

The final outcome is 500971.0924855, with a leftover of 8.5e-07.