Number Theory Calculators: Primes, Factors and Divisibility
Number theory tools answer questions about whole numbers: is this number prime, what are its factors, what is the highest common factor of two numbers, and what is left over after division.
These tools use exact whole number arithmetic, so they give correct answers even for very large numbers.
GCD and LCM CalculatorFind the highest common factor and lowest common multiple of two or more numbers.Prime Number CheckerCheck whether numbers are prime, see their prime factors and find the next prime.Modulo CalculatorFind the remainder of a division, a power modulo a number, or the modular inverse, with correct handling of negative numbers.Fibonacci CalculatorFind any Fibonacci number exactly, list the first terms, or check whether a number is in the sequence.Factors and Prime Factorisation CalculatorList every factor of a number, see its prime factorisation with the division steps, and learn whether it is prime, square or perfect.
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