18538663165 has 8 divisors (see below), whose sum is σ = 24268795488. Its totient is φ = 13482664080.

The previous prime is 18538663151. The next prime is 18538663207. The reversal of 18538663165 is 56136683581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18538663165 - 2¹¹ = 18538661117 is a prime.

It is a Duffinian number.

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, 168533247 + ... + 168533356.

It is an arithmetic number, because the mean of its divisors is an integer number (3033599436).

Almost surely, 2^18538663165 is an apocalyptic number.

It is an amenable number.

18538663165 is a deficient number, since it is larger than the sum of its proper divisors (5730132323).

18538663165 is a wasteful number, since it uses less digits than its factorization.

18538663165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337066619.

The product of its digits is 3110400, while the sum is 52.

The spelling of 18538663165 in words is "eighteen billion, five hundred thirty-eight million, six hundred sixty-three thousand, one hundred sixty-five".