64472118436818 has 12 divisors (see below), whose sum is σ = 139689589946478. Its totient is φ = 21490706145600.

The previous prime is 64472118436799. The next prime is 64472118436823. The reversal of 64472118436818 is 81863481127446.

64472118436818 is a `hidden beast` number, since 6 + 4 + 4 + 7 + 2 + 118 + 436 + 81 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 60167061968049 + 4305056468769 = 7756743^2 + 2074863^2 .

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1790892178783 + ... + 1790892178818.

Almost surely, 2^{64472118436818} is an apocalyptic number.

64472118436818 is an abundant number, since it is smaller than the sum of its proper divisors (75217471509660).

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

64472118436818 is a wasteful number, since it uses less digits than its factorization.

64472118436818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581784357609 (or 3581784357606 counting only the distinct ones).

The product of its digits is 49545216, while the sum is 63.

The spelling of 64472118436818 in words is "sixty-four trillion, four hundred seventy-two billion, one hundred eighteen million, four hundred thirty-six thousand, eight hundred eighteen".