18512867844 has 45 divisors (see below), whose sum is σ = 48402696727. Its totient is φ = 6170139576.

The previous prime is 18512867827. The next prime is 18512867917. The reversal of 18512867844 is 44876821581.

The square root of 18512867844 is 136062.

It is a perfect power (a square), and thus also a powerful number.

18512867844 is a `hidden beast` number, since 1 + 8 + 512 + 86 + 7 + 8 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2445337 + ... + 2452895.

Almost surely, 2^18512867844 is an apocalyptic number.

18512867844 is the 136062-nd square number.

It is an amenable number.

18512867844 is an abundant number, since it is smaller than the sum of its proper divisors (29889828883).

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

18512867844 is an frugal number, since it uses more digits than its factorization.

18512867844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15134 (or 7564 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 54.

The spelling of 18512867844 in words is "eighteen billion, five hundred twelve million, eight hundred sixty-seven thousand, eight hundred forty-four".