18031664428 has 24 divisors (see below), whose sum is σ = 32652925200. Its totient is φ = 8702436288.

The previous prime is 18031664423. The next prime is 18031664447. The reversal of 18031664428 is 82446613081.

It is not an unprimeable number, because it can be changed into a prime (18031664423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419983 + ... + 460921.

It is an arithmetic number, because the mean of its divisors is an integer number (1360538550).

Almost surely, 2^18031664428 is an apocalyptic number.

It is an amenable number.

18031664428 is a deficient number, since it is larger than the sum of its proper divisors (14621260772).

18031664428 is a wasteful number, since it uses less digits than its factorization.

18031664428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44769 (or 44767 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 18031664428 in words is "eighteen billion, thirty-one million, six hundred sixty-four thousand, four hundred twenty-eight".