18319320909 has 16 divisors (see below), whose sum is σ = 28075588800. Its totient is φ = 11791746288.

The previous prime is 18319320893. The next prime is 18319320919. The reversal of 18319320909 is 90902391381.

It is a happy number.

18319320909 is a `hidden beast` number, since 1 + 8 + 319 + 320 + 9 + 0 + 9 = 666.

It is not a de Polignac number, because 18319320909 - 2⁴ = 18319320893 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18319320919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11697379 + ... + 11698944.

It is an arithmetic number, because the mean of its divisors is an integer number (1754724300).

Almost surely, 2^18319320909 is an apocalyptic number.

It is an amenable number.

18319320909 is a deficient number, since it is larger than the sum of its proper divisors (9756267891).

18319320909 is a wasteful number, since it uses less digits than its factorization.

18319320909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23396361 (or 23396355 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The spelling of 18319320909 in words is "eighteen billion, three hundred nineteen million, three hundred twenty thousand, nine hundred nine".