XICalc is an integer calculator program with the following features: multiple precision integers with millions of digits; uses Hartley Transform to speed-up long multiplies; separate input and output notation, base 2 to base 36; greatest common divisor function; Modulo arithmetic options; Bernoulli numbers, Euler Numbers; Boolean functions; random number generator; prime factor algorithm using the Elliptic Curve Method; number theoretic functions phi, sigma and tau; prime testing and searching using the Adleman function; algebraic notation (not reverse polish); if-then-else statement; go-to statement; can run XICalc code from files; hot help from F1 key; and it’s written in Microsoft Visual C# .