51216011856 has 80 divisors (see below), whose sum is σ = 147594928320. Its totient is φ = 17003952000.

The previous prime is 51216011851. The next prime is 51216011857. The reversal of 51216011856 is 65811061215.

51216011856 is a `hidden beast` number, since 512 + 1 + 60 + 1 + 1 + 85 + 6 = 666.

51216011856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51216011856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51216011851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127735 + ... + 344598.

It is an arithmetic number, because the mean of its divisors is an integer number (1844936604).

Almost surely, 2^51216011856 is an apocalyptic number.

It is an amenable number.

51216011856 is an abundant number, since it is smaller than the sum of its proper divisors (96378916464).

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

51216011856 is a wasteful number, since it uses less digits than its factorization.

51216011856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472601 (or 472589 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The spelling of 51216011856 in words is "fifty-one billion, two hundred sixteen million, eleven thousand, eight hundred fifty-six".