**To change modulo :**

**To change modulo to gogol number : 10^100**

**4 operations :**

**Clear button :** clear all except stocked number and modulo

**Mod button :** give the residue modulo

**Factorial button :** give the factorial of the screen number

*Example* : 5! = 120

**Inverse button :** give the inverse modulo of the screen number. If the screen number is prime and there is no inverse fot it, this is one divisor of the modulo.

*Example* : 3 has no inverse modulo 15, but 3 has an inverse modulo 1001. 3 divides 15 but not 1001. 334 is the inverse of 3 modulo 1001 because 3*334 = 1002 = 1 modulo 1001.

**Sto and Rcl buttons : **to stocke a number and to recall it later.

**Enter or egal modulo :** to give the result modulo of the operation