18167404409 has 16 divisors (see below), whose sum is σ = 23431317120. Its totient is φ = 13668264960.

The previous prime is 18167404403. The next prime is 18167404417. The reversal of 18167404409 is 90440476181.

It is a happy number.

It is not a de Polignac number, because 18167404409 - 2¹² = 18167400313 is a prime.

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 18167404409.

It is not an unprimeable number, because it can be changed into a prime (18167404403) 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, 4065704 + ... + 4070169.

It is an arithmetic number, because the mean of its divisors is an integer number (1464457320).

Almost surely, 2^18167404409 is an apocalyptic number.

It is an amenable number.

18167404409 is a deficient number, since it is larger than the sum of its proper divisors (5263912711).

18167404409 is a wasteful number, since it uses less digits than its factorization.

18167404409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8135920.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 18167404409 in words is "eighteen billion, one hundred sixty-seven million, four hundred four thousand, four hundred nine".