72178971865 has 32 divisors (see below), whose sum is σ = 116293959936. Its totient is φ = 41533551360.

The previous prime is 72178971857. The next prime is 72178971877. The reversal of 72178971865 is 56817987127.

It is not a de Polignac number, because 72178971865 - 2³ = 72178971857 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 7205682 + ... + 7215691.

It is an arithmetic number, because the mean of its divisors is an integer number (3634186248).

Almost surely, 2^72178971865 is an apocalyptic number.

It is an amenable number.

72178971865 is a deficient number, since it is larger than the sum of its proper divisors (44114988071).

72178971865 is a wasteful number, since it uses less digits than its factorization.

72178971865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14421409.

The product of its digits is 11854080, while the sum is 61.

The spelling of 72178971865 in words is "seventy-two billion, one hundred seventy-eight million, nine hundred seventy-one thousand, eight hundred sixty-five".