Primes and Prime Factors App!

Primes, Prime FactorsAboutThis app lets you check numbers to see if they are prime numbers, find next prime, find primes within an interval (range), and determining prime factors. The input numbers need be between 0 and 9,223,372,036,854,775,807, which is 2^63-1, or approximately 9.22310^18. I will read every mail if it is written in English :)