number theory Calculators

GCD Calculator

Calculate the Greatest Common Divisor of two numbers

Calculate the Least Common Multiple of two numbers

Check if a number is prime

Calculate the factorial of a number

Calculate the nth Fibonacci number

Calculate (a + b) mod m, (a - b) mod m, and (a * b) mod m

Check if a number is a perfect number

Calculate Euler's totient function φ(n)

Count the number of divisors of a given number

Convert binary numbers to decimal