18365640404 has 12 divisors (see below), whose sum is σ = 32194627584. Its totient is φ = 9167175384.

The previous prime is 18365640373. The next prime is 18365640443. The reversal of 18365640404 is 40404656381.

It is a happy number.

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, 3908564 + ... + 3913259.

It is an arithmetic number, because the mean of its divisors is an integer number (2682885632).

Almost surely, 2^18365640404 is an apocalyptic number.

It is an amenable number.

18365640404 is a deficient number, since it is larger than the sum of its proper divisors (13828987180).

18365640404 is a wasteful number, since it uses less digits than its factorization.

18365640404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7822414 (or 7822412 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 18365640404 in words is "eighteen billion, three hundred sixty-five million, six hundred forty thousand, four hundred four".