18977266564 has 9 divisors (see below), whose sum is σ = 33210698647. Its totient is φ = 9488495524.

The previous prime is 18977266547. The next prime is 18977266573. The reversal of 18977266564 is 46566277981.

It is a happy number.

The square root of 18977266564 is 137758.

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

It is a super-2 number, since 2×18977266564² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 241077 + ... + 309955.

Almost surely, 2^18977266564 is an apocalyptic number.

18977266564 is the 137758-th square number.

It is an amenable number.

18977266564 is a deficient number, since it is larger than the sum of its proper divisors (14233432083).

18977266564 is an frugal number, since it uses more digits than its factorization.

18977266564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137762 (or 68881 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 61.

The spelling of 18977266564 in words is "eighteen billion, nine hundred seventy-seven million, two hundred sixty-six thousand, five hundred sixty-four".