18165505139564 has 6 divisors (see below), whose sum is σ = 31789633994244. Its totient is φ = 9082752569780.

The previous prime is 18165505139503. The next prime is 18165505139581. The reversal of 18165505139564 is 46593150556181.

It is a super-2 number, since 2×18165505139564² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2270688142442 + ... + 2270688142449.

It is an arithmetic number, because the mean of its divisors is an integer number (5298272332374).

Almost surely, 2^{18165505139564} is an apocalyptic number.

It is an amenable number.

18165505139564 is a deficient number, since it is larger than the sum of its proper divisors (13624128854680).

18165505139564 is a wasteful number, since it uses less digits than its factorization.

18165505139564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4541376284895 (or 4541376284893 counting only the distinct ones).

The product of its (nonzero) digits is 19440000, while the sum is 59.

The spelling of 18165505139564 in words is "eighteen trillion, one hundred sixty-five billion, five hundred five million, one hundred thirty-nine thousand, five hundred sixty-four".