18039780816 has 40 divisors (see below), whose sum is σ = 46802808000. Its totient is φ = 5987448576.

The previous prime is 18039780769. The next prime is 18039780821. The reversal of 18039780816 is 61808793081.

It is a congruent number.

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, 795316 + ... + 817683.

It is an arithmetic number, because the mean of its divisors is an integer number (1170070200).

Almost surely, 2^18039780816 is an apocalyptic number.

18039780816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18039780816 is an abundant number, since it is smaller than the sum of its proper divisors (28763027184).

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

18039780816 is a wasteful number, since it uses less digits than its factorization.

18039780816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613243 (or 1613237 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 18039780816 in words is "eighteen billion, thirty-nine million, seven hundred eighty thousand, eight hundred sixteen".