18216405320 has 32 divisors (see below), whose sum is σ = 41150229120. Its totient is φ = 7257528000.

The previous prime is 18216405313. The next prime is 18216405331. The reversal of 18216405320 is 2350461281.

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, 897152 + ... + 917231.

It is an arithmetic number, because the mean of its divisors is an integer number (1285944660).

Almost surely, 2^18216405320 is an apocalyptic number.

18216405320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18216405320 is an abundant number, since it is smaller than the sum of its proper divisors (22933823800).

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

18216405320 is a wasteful number, since it uses less digits than its factorization.

18216405320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814645 (or 1814641 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 18216405320 in words is "eighteen billion, two hundred sixteen million, four hundred five thousand, three hundred twenty".