18539836845 has 16 divisors (see below), whose sum is σ = 29702132352. Its totient is φ = 9875115200.

The previous prime is 18539836831. The next prime is 18539836921. The reversal of 18539836845 is 54863893581.

It is not a de Polignac number, because 18539836845 - 2⁵ = 18539836813 is a prime.

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, 787881 + ... + 811070.

It is an arithmetic number, because the mean of its divisors is an integer number (1856383272).

Almost surely, 2^18539836845 is an apocalyptic number.

18539836845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18539836845 is a deficient number, since it is larger than the sum of its proper divisors (11162295507).

18539836845 is a wasteful number, since it uses less digits than its factorization.

18539836845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599732.

The product of its digits is 24883200, while the sum is 60.

The spelling of 18539836845 in words is "eighteen billion, five hundred thirty-nine million, eight hundred thirty-six thousand, eight hundred forty-five".