18815409880 has 16 divisors (see below), whose sum is σ = 42334672320. Its totient is φ = 7526163936.

The previous prime is 18815409869. The next prime is 18815409959. The reversal of 18815409880 is 8890451881.

It is a super-2 number, since 2×18815409880² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235192584 + ... + 235192663.

It is an arithmetic number, because the mean of its divisors is an integer number (2645917020).

Almost surely, 2^18815409880 is an apocalyptic number.

18815409880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18815409880 is an abundant number, since it is smaller than the sum of its proper divisors (23519262440).

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

18815409880 is a wasteful number, since it uses less digits than its factorization.

18815409880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470385258 (or 470385254 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 52.

The spelling of 18815409880 in words is "eighteen billion, eight hundred fifteen million, four hundred nine thousand, eight hundred eighty".