18397171296 has 72 divisors (see below), whose sum is σ = 59790813264. Its totient is φ = 5256334080.

The previous prime is 18397171279. The next prime is 18397171297. The reversal of 18397171296 is 69217179381.

It is a happy number.

18397171296 is a `hidden beast` number, since 183 + 9 + 7 + 171 + 296 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18397171297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4560775 + ... + 4564806.

It is an arithmetic number, because the mean of its divisors is an integer number (830427962).

Almost surely, 2^18397171296 is an apocalyptic number.

18397171296 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18397171296 is an abundant number, since it is smaller than the sum of its proper divisors (41393641968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18397171296 is a wasteful number, since it uses less digits than its factorization.

18397171296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9125604 (or 9125593 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The spelling of 18397171296 in words is "eighteen billion, three hundred ninety-seven million, one hundred seventy-one thousand, two hundred ninety-six".