18779995800 has 120 divisors (see below), whose sum is σ = 65225763900. Its totient is φ = 5007994560.

The previous prime is 18779995799. The next prime is 18779995837. The reversal of 18779995800 is 859997781.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 563430 + ... + 595829.

Almost surely, 2^18779995800 is an apocalyptic number.

18779995800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18779995800 is an abundant number, since it is smaller than the sum of its proper divisors (46445768100).

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

18779995800 is a wasteful number, since it uses less digits than its factorization.

18779995800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159287 (or 1159269 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 63.

The spelling of 18779995800 in words is "eighteen billion, seven hundred seventy-nine million, nine hundred ninety-five thousand, eight hundred".