18729805165 has 16 divisors (see below), whose sum is σ = 24832562688. Its totient is φ = 13489290496.

The previous prime is 18729805147. The next prime is 18729805189. The reversal of 18729805165 is 56150892781.

It is a cyclic number.

It is not a de Polignac number, because 18729805165 - 2¹¹ = 18729803117 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 15 ways as a sum of consecutive naturals, for example, 4788277 + ... + 4792186.

It is an arithmetic number, because the mean of its divisors is an integer number (1552035168).

Almost surely, 2^18729805165 is an apocalyptic number.

It is an amenable number.

18729805165 is a deficient number, since it is larger than the sum of its proper divisors (6102757523).

18729805165 is a wasteful number, since it uses less digits than its factorization.

18729805165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9580508.

The product of its (nonzero) digits is 1209600, while the sum is 52.

The spelling of 18729805165 in words is "eighteen billion, seven hundred twenty-nine million, eight hundred five thousand, one hundred sixty-five".