In operations management

This code performs several operations on a number input by the user. However, there are some issues and improvements that can be made. Review the code and address the following questions:

Identify any issues or potential errors in the factorial function when the number is too large.

The isPrime function can be optimized. How would you improve the loop to reduce unnecessary checks?

There's an issue with the factorial function for negative inputs. Modify it so that it properly handles negative input cases.

Can you suggest an improvement to the reverseNumber function to handle negative numbers?