18516768434185 has 16 divisors (see below), whose sum is σ = 25405135823232. Its totient is φ = 12691857369600.

The previous prime is 18516768434161. The next prime is 18516768434267. The reversal of 18516768434185 is 58143486761581.

It is not a de Polignac number, because 18516768434185 - 2⁷ = 18516768434057 is a prime.

It is a super-2 number, since 2×18516768434185² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18516768434185.

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, 111483976 + ... + 111649945.

It is an arithmetic number, because the mean of its divisors is an integer number (1587820988952).

Almost surely, 2^{18516768434185} is an apocalyptic number.

It is an amenable number.

18516768434185 is a deficient number, since it is larger than the sum of its proper divisors (6888367389047).

18516768434185 is a wasteful number, since it uses less digits than its factorization.

18516768434185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223136304.

The product of its digits is 154828800, while the sum is 67.

The spelling of 18516768434185 in words is "eighteen trillion, five hundred sixteen billion, seven hundred sixty-eight million, four hundred thirty-four thousand, one hundred eighty-five".