18013516415 has 16 divisors (see below), whose sum is σ = 22205171712. Its totient is φ = 14018344704.

The previous prime is 18013516379. The next prime is 18013516459. The reversal of 18013516415 is 51461531081.

It is a cyclic number.

It is not a de Polignac number, because 18013516415 - 2²⁰ = 18012467839 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, 1320962 + ... + 1334528.

It is an arithmetic number, because the mean of its divisors is an integer number (1387823232).

Almost surely, 2^18013516415 is an apocalyptic number.

18013516415 is a deficient number, since it is larger than the sum of its proper divisors (4191655297).

18013516415 is a wasteful number, since it uses less digits than its factorization.

18013516415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20786.

The product of its (nonzero) digits is 14400, while the sum is 35.

The spelling of 18013516415 in words is "eighteen billion, thirteen million, five hundred sixteen thousand, four hundred fifteen".