18384401864 has 16 divisors (see below), whose sum is σ = 34512447600. Its totient is φ = 9181082512.

The previous prime is 18384401863. The next prime is 18384401869. The reversal of 18384401864 is 46810448381.

It is not an unprimeable number, because it can be changed into a prime (18384401863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1382774 + ... + 1396005.

It is an arithmetic number, because the mean of its divisors is an integer number (2157027975).

Almost surely, 2^18384401864 is an apocalyptic number.

It is an amenable number.

18384401864 is a deficient number, since it is larger than the sum of its proper divisors (16128045736).

18384401864 is a wasteful number, since it uses less digits than its factorization.

18384401864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779612 (or 2779608 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 47.

The spelling of 18384401864 in words is "eighteen billion, three hundred eighty-four million, four hundred one thousand, eight hundred sixty-four".