I'm looking for a Mathematical solution that deals with really (long, big, huge, storms) numbers. I haven't found anything yet, But I don't wanna think that this problem hasn't be solve at this time. I'm looking for an easy Number solution, like Microsoft Excel Precision (30 decimals), or a BigInteger (Java) solution. in Javascript of course.

It looks like this has been solved before:

What is the standard solution in Javascript for handling big numbers (BigNum)?

http://jsfromhell.com/classes/bignumber

http://www-cs-students.stanford.edu/~tjw/jsbn/

If you only need integers you can use BigInteger.js.

While looking for an big integer library for an ElGamal crypto implementation I tested several libraries with the following results:

*I recommend this one:* **Tom Wu's jsbn.js (http://www-cs-students.stanford.edu/~tjw/jsbn/)**

- Comprehensive set of functions and fast

**Leemon Baird's big integer library (http://www.leemon.com/crypto/BigInt.js)**

- Comprehensive set of functions and pretty fast
**BUT:**Negative number representation is buggy!

**bignumber.js (https://github.com/MikeMcl/bignumber.js)**

- Pretty complete set of functions
**BUT:**Converting really big numbers from strings into BigNumber objects result in INFINITY

**Scheme arithmetic library for JavaScript (https://github.com/jtobey/javascript-bignum)**

- JS-Implementation of Scheme arithmetic functions
**BUT:**No function for y= x^e mod n

*I haven't tested this by myself:* **BigNumber (http://jsfromhell.com/classes/bignumber)**

- Functions for high precision claculations
**BUT:**It's said to be slow due to internal representation of numbers as strings

There's a BigInteger library for JavaScript available here:

(Note that I haven't used this myself. Try it and see what you think.)

There is also Silent Matt's library for Big Integers. It does not handle decimals.

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