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This new iPhone calculator is amazing ! This is a MODULO calculator ! All you ever wanted to know about (big) integers without ever daring to hope for it !

What are all the digits of the factorial of 69 and how many digits ?
What is the gogol number ?

How many integers of the form 10^n+1 are prime ? (like 101)

Want to know if a big integer is prime ? The change mod function indicates when the number is prime.

Want to know the divisors of an integer ? A prime divisor has no inverse modulo this integer.

This is a modulo calculator overpowering almost limitless! (only display is limited !)

With modulo gogol, calculus are exact until 100 digits !

The "n!" button calculates the factorial of an integer from 0 to 2000 (v2.0). Factorial are limited to factorial of 2000!

The "change mod" (change modulo) function indicates when the modulo is prime. There are no limit to the modulo except the display.

The "mod gogol" button set a modulo to 10^100 (gogol number).

You can stoke one number and recall it when you want.

The "Mod" operation indicates the residue modulo N.

The exp function allow modular exponentiation (as + - *)

The "INV" function calculates the inverse of an integer modulo N.

This app is intended for both mathematics teachers and/or their students, or if you are interested in the beauty of numbers.

Enjoy calcMod-ProX !

Les commentaires sont disponibles en français (réglages).

What’s New

Version 2.0

- Text display enhancements for iOS 15 and MacOS Monterey (Truncate for big numbers but minimum character size set)
- Possibility to copy the result to the clipboard by clicking on the display!
- Factorial calculation up to 2000!

App Privacy

The developer, Alain Cardinaux, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary based on, for example, the features you use or your age. Learn More


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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