18319727164 has 12 divisors (see below), whose sum is σ = 32060574784. Its totient is φ = 9159562944.

The previous prime is 18319727117. The next prime is 18319727207. The reversal of 18319727164 is 46172791381.

It is a super-2 number, since 2×18319727164² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115924 + ... + 223780.

Almost surely, 2^18319727164 is an apocalyptic number.

It is an amenable number.

18319727164 is a deficient number, since it is larger than the sum of its proper divisors (13740847620).

18319727164 is a wasteful number, since it uses less digits than its factorization.

18319727164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150324 (or 150322 counting only the distinct ones).

The product of its digits is 508032, while the sum is 49.

The spelling of 18319727164 in words is "eighteen billion, three hundred nineteen million, seven hundred twenty-seven thousand, one hundred sixty-four".