18391365798 has 32 divisors (see below), whose sum is σ = 39625555200. Its totient is φ = 5656970016.

The previous prime is 18391365767. The next prime is 18391365851. The reversal of 18391365798 is 89756319381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201873 + ... + 278451.

It is an arithmetic number, because the mean of its divisors is an integer number (1238298600).

Almost surely, 2^18391365798 is an apocalyptic number.

18391365798 is an abundant number, since it is smaller than the sum of its proper divisors (21234189402).

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

18391365798 is a wasteful number, since it uses less digits than its factorization.

18391365798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79676.

The product of its digits is 9797760, while the sum is 60.

The spelling of 18391365798 in words is "eighteen billion, three hundred ninety-one million, three hundred sixty-five thousand, seven hundred ninety-eight".