We look at the division of 66513259 by 526 
The aim is to understand the frequency of 526 in 66513259.

Going ahead to step 1:
When dividing 6 by 526, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 526

Step 2:
66 divided by 526 is 0 with a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Grab the next digit (5) from the dividend, add it to 66, then carry on: 665 / 526

Moving on to step 3:
The number 526 fits into 665 1 times, leaving a remainder of 139.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 526 from 665, we get 139.
Include the next digit (1) from the dividend after 139, then repeat: 1391 / 526

Moving on to step 4:
526 goes into 1391 2 times with a remainder of 339.
Put 2 as the next digit of the answer. 
Result so far: 12.0
The remainder is 339 after subtracting 1052 from 1391.
Bring next digit (3) of the dividend behind the 339 and repeat the process: 3393 / 526

Going ahead to step 5:
When dividing 3393 by 526, we get 6 with a remainder of 237.
Use 6 as the next digit of our solution. 
Result so far: 126.0
Deduct 3156 from 3393 and we're left with 237.
Include the next digit (2) from the dividend after 237, then repeat: 2372 / 526

Let's proceed to step 6:
526 can be fit into 2372 4 times, resulting in a remainder of 268.
The number 4 becomes the next digit in our result. 
Result so far: 1264.0
Subtract 2104 from 2372 to get 268.
Grab the next digit (5) from the dividend, add it to 268, then carry on: 2685 / 526

Advancing to step 7:
2685 divided by 526 is 5 with a remainder of 55.
Record the quotient 5 as the next digit in the result. 
Result so far: 12645.0
If we take 2630 away from 2685, we end up with 55.
Take the next digit (9) from the dividend and append it to 55, then repeat: 559 / 526

Advancing to step 8:
526 goes into 559 1 times with a remainder of 33.
Use 1 as the next digit of our solution. 
Result so far: 126451.0
The remainder is 33 after subtracting 526 from 559.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 9:
The number 526 fits into 330 0 times, leaving a remainder of 330.
Write down 0 as next digit of the result. 
Result so far: 126451.0
Subtracting 0 from 330 leaves us with 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Let's proceed to step 10:
526 can be fit into 3300 6 times, resulting in a remainder of 144.
Record the quotient 6 as the next digit in the result. 
Result so far: 126451.06
If we subtract 3156 from 3300, we get 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Going ahead to step 11:
526 can be fit into 1440 2 times, resulting in a remainder of 388.
The next digit of our result is 2. 
Result so far: 126451.062
If we subtract 1052 from 1440, we get 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

Let's proceed to step 12:
526 goes into 3880 7 times with a remainder of 198.
Write down 7 as next digit of the result. 
Result so far: 126451.0627
Subtracting 3682 from 3880 leaves us with 198.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1980, and continue the process.

Let's proceed to step 13:
1980 divided by 526 is 3 with a remainder of 402.
Write down 3 as next digit of the result. 
Result so far: 126451.06273
Subtract 1578 from 1980 to get 402.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4020, and continue the process.

Moving on to step 14:
The number 526 fits into 4020 7 times, leaving a remainder of 338.
The next digit of our result is 7. 
Result so far: 126451.062737
If we take 3682 away from 4020, we end up with 338.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

Advancing to step 15:
The number 526 fits into 3380 6 times, leaving a remainder of 224.
Write down 6 as next digit of the result. 
Result so far: 126451.0627376
Deduct 3156 from 3380 and we're left with 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

Going ahead to step 16:
526 goes into 2240 4 times with a remainder of 136.
Write down 4 as next digit of the result. 
Result so far: 126451.06273764
Subtracting 2104 from 2240 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 126451.06273764, with a leftover of 1.36e-07.