We divide 643601 by 1
We want to figure out the number of times 643601 can be divided by 1.

Going ahead to step 1:
When dividing 6 by 1, we get 6 with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Deduct 6 from 6 and we're left with 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 1

Let's proceed to step 2:
The number 1 fits into 4 4 times, leaving a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 64.0
Subtract 4 from 4 to get 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 1

Step 3:
If we divide 3 by 1, we get 3 and a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 643.0
If we subtract 3 from 3, we get 0.
Include the next digit (6) from the dividend after 0, then repeat: 6 / 1

Step 4:
The number 1 fits into 6 6 times, leaving a remainder of 0.
Use 6 as the next digit of our solution. 
Result so far: 6436.0
Subtract 6 from 6 to get 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 1

Let's proceed to step 5:
1 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 64360.0
The remainder is 0 after subtracting 0 from 0.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 1

Moving on to step 6:
1 can be fit into 1 1 times, resulting in a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 643601.0
Deduct 1 from 1 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
If we divide 0 by 1, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 643601.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
1 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 643601.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 643601.0 with a balance of 0.0.