18919372032 has 108 divisors (see below), whose sum is σ = 59508312864. Its totient is φ = 5733135360.

The previous prime is 18919371941. The next prime is 18919372099. The reversal of 18919372032 is 23027391981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 347908 + ... + 398595.

Almost surely, 2^18919372032 is an apocalyptic number.

18919372032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18919372032 is an abundant number, since it is smaller than the sum of its proper divisors (40588940832).

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

18919372032 is a wasteful number, since it uses less digits than its factorization.

18919372032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746536 (or 746519 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 18919372032 in words is "eighteen billion, nine hundred nineteen million, three hundred seventy-two thousand, thirty-two".