how to turn an integer into a string

So for a project, I am working on an Arduino project, and I need to turn an integer, very long integers, into a string. can somebody help me with this?
I would be using the big number library. (GitHub - nickgammon/BigNumber: BigNumber library for the Arduino) The code would be doing some math, and that output would give me the number.

The project is an encryption system, so I would have to turn an int into a string many many times. (the code most. likely would be on a loop.)

The integer to ASCII function http://www.cplusplus.com/reference/cstdlib/itoa/

is that function available on an Arduino?

Yes, it is a C++ function. Arduino is programmed using the C++ language.

so I messed up in my question, and I meant how to convert long integers, over 10 digits long into integers.

I don't know what you mean there. Can you give an example of the program input and output?

so I would input: 5307878626309103053766094186556322974789734
I want that to become a string instead of an int.

And how is that input to the Arduino? Via the serial port?

no, it would be inputted by code on the Arduino. I would be using the big number library. the code would be doing some math, and that output would give me the number.

The project is an encryption system, so I would have to turn an int into a string many many times. (the code most. likely would be on a loop.)

I have no experience with the big number library so can't help with that.

The big number library? What particular library is that? Does it have print method(s) built in?

This is the big number library

I would be using the big number library. the code would be doing some math, and that output would give me the number.

In my understanding, Nick Gammon's BigNumber Library outputs a null terminated character array.

What library functions are you using to give integer results.

Can you provide a minimal example of what you are trying to do?