18231418820 has 24 divisors (see below), whose sum is σ = 38291400000. Its totient is φ = 7291535072.

The previous prime is 18231418819. The next prime is 18231418847. The reversal of 18231418820 is 2881413281.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89201 + ... + 210759.

It is an arithmetic number, because the mean of its divisors is an integer number (1595475000).

Almost surely, 2^18231418820 is an apocalyptic number.

18231418820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18231418820 is an abundant number, since it is smaller than the sum of its proper divisors (20059981180).

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

18231418820 is a wasteful number, since it uses less digits than its factorization.

18231418820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129067 (or 129065 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 38.

The spelling of 18231418820 in words is "eighteen billion, two hundred thirty-one million, four hundred eighteen thousand, eight hundred twenty".