About the Number Theory Tools

The Number Theory Tools cover prime factorization (up to 10¹²), LCM and GCD of multiple numbers, primality testing, modular arithmetic (including fast modular exponentiation), and Euler's totient function. Useful for competitive programming, cryptography and discrete mathematics.

How to use the Number Theory Tools

  1. Choose an operation from the dropdown.
  2. Enter your number(s).
  3. Click Calculate to see the result with full working.

Frequently asked questions

Is this tool free to use?

Yes. The Number Theory Tools is completely free with no sign-up and no limits.

Is my data uploaded to a server?

No. All calculations run in your browser using JavaScript. Nothing is sent to any server.

Does it work offline?

Yes. Once the page is loaded, all computations work without an internet connection.

Does it work on mobile?

Yes, it works in any modern browser on desktop, tablet and mobile.

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Related keywords

prime factorizationlcm calculatorgcd hcf calculatorprimality testmodular arithmeticeuler totient function