51291515800056 has 64 divisors (see below), whose sum is σ = 146587240915200. Its totient is φ = 14650713508608.

The previous prime is 51291515800043. The next prime is 51291515800081. The reversal of 51291515800056 is 65000851519215.

51291515800056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51291515799978 and 51291515800014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41105245 + ... + 42334668.

It is an arithmetic number, because the mean of its divisors is an integer number (2290425639300).

Almost surely, 2^{51291515800056} is an apocalyptic number.

51291515800056 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51291515800056 is an abundant number, since it is smaller than the sum of its proper divisors (95295725115144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51291515800056 is a wasteful number, since it uses less digits than its factorization.

51291515800056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83443588 (or 83443584 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 48.

The spelling of 51291515800056 in words is "fifty-one trillion, two hundred ninety-one billion, five hundred fifteen million, eight hundred thousand, fifty-six".