51605617616 has 40 divisors (see below), whose sum is σ = 114283518720. Its totient is φ = 22113995904.

The previous prime is 51605617589. The next prime is 51605617699. The reversal of 51605617616 is 61671650615.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1093190 + ... + 1139418.

It is an arithmetic number, because the mean of its divisors is an integer number (2857087968).

Almost surely, 2^51605617616 is an apocalyptic number.

51605617616 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51605617616 is an abundant number, since it is smaller than the sum of its proper divisors (62677901104).

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

51605617616 is a wasteful number, since it uses less digits than its factorization.

51605617616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56211 (or 56205 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 51605617616 in words is "fifty-one billion, six hundred five million, six hundred seventeen thousand, six hundred sixteen".