We're dividing 66919634 by 259 
The aim is to understand the frequency of 259 in 66919634.

On to step 1:
259 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 259

Step 2:
The number 259 fits into 66 0 times, leaving a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Append the next digit (9) from the dividend to 66 and continue with: 669 / 259

Advancing to step 3:
259 goes into 669 2 times with a remainder of 151.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 518 from 669 and we're left with 151.
Fetch the next digit (1) from the dividend, attach it to 151 and continue: 1511 / 259

On to step 4:
259 goes into 1511 5 times with a remainder of 216.
Record the quotient 5 as the next digit in the result. 
Result so far: 25.0
The remainder is 216 after subtracting 1295 from 1511.
Bring next digit (9) of the dividend behind the 216 and repeat the process: 2169 / 259

Step 5:
259 goes into 2169 8 times with a remainder of 97.
The next digit of our result is 8. 
Result so far: 258.0
Deduct 2072 from 2169 and we're left with 97.
Take the next digit (6) from the dividend and append it to 97, then repeat: 976 / 259

Moving on to step 6:
If we divide 976 by 259, we get 3 and a remainder of 199.
Record the quotient 3 as the next digit in the result. 
Result so far: 2583.0
If we take 777 away from 976, we end up with 199.
Append the next digit (3) from the dividend to 199 and continue with: 1993 / 259

Going ahead to step 7:
The number 259 fits into 1993 7 times, leaving a remainder of 180.
Use 7 as the next digit of our solution. 
Result so far: 25837.0
Subtracting 1813 from 1993 leaves us with 180.
Take the next digit (4) from the dividend and append it to 180, then repeat: 1804 / 259

On to step 8:
The number 259 fits into 1804 6 times, leaving a remainder of 250.
Write down 6 as next digit of the result. 
Result so far: 258376.0
If we subtract 1554 from 1804, we get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

On to step 9:
259 goes into 2500 9 times with a remainder of 169.
Use 9 as the next digit of our solution. 
Result so far: 258376.9
The remainder is 169 after subtracting 2331 from 2500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

Step 10:
If we divide 1690 by 259, we get 6 and a remainder of 136.
Record the quotient 6 as the next digit in the result. 
Result so far: 258376.96
If we subtract 1554 from 1690, we get 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Step 11:
259 can be fit into 1360 5 times, resulting in a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 258376.965
The remainder is 65 after subtracting 1295 from 1360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 12:
The number 259 fits into 650 2 times, leaving a remainder of 132.
Use 2 as the next digit of our solution. 
Result so far: 258376.9652
Subtracting 518 from 650 leaves us with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Let's proceed to step 13:
When dividing 1320 by 259, we get 5 with a remainder of 25.
The next digit of our result is 5. 
Result so far: 258376.96525
Deduct 1295 from 1320 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 14:
If we divide 250 by 259, we get 0 and a remainder of 250.
Write down 0 as next digit of the result. 
Result so far: 258376.96525
Subtracting 0 from 250 leaves us with 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Step 15:
When dividing 2500 by 259, we get 9 with a remainder of 169.
Use 9 as the next digit of our solution. 
Result so far: 258376.9652509
If we subtract 2331 from 2500, we get 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

Moving on to step 16:
The number 259 fits into 1690 6 times, leaving a remainder of 136.
The number 6 becomes the next digit in our result. 
Result so far: 258376.96525096
Subtracting 1554 from 1690 leaves us with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

The final outcome is 258376.96525096, with a leftover of 1.36e-07.