18877660816 has 75 divisors (see below), whose sum is σ = 42729795593. Its totient is φ = 8078884800.

The previous prime is 18877660801. The next prime is 18877660853. The reversal of 18877660816 is 61806677881.

The square root of 18877660816 is 137396.

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

It can be written as a sum of positive squares in only one way, i.e., 16280739216 + 2596921600 = 127596^2 + 50960^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 26929266 + ... + 26929966.

Almost surely, 2^18877660816 is an apocalyptic number.

18877660816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18877660816 is the 137396-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18877660816

18877660816 is an abundant number, since it is smaller than the sum of its proper divisors (23852134777).

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

18877660816 is an frugal number, since it uses more digits than its factorization.

18877660816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438 (or 710 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 58.

The spelling of 18877660816 in words is "eighteen billion, eight hundred seventy-seven million, six hundred sixty thousand, eight hundred sixteen".