18493408609 has 16 divisors (see below), whose sum is σ = 20198166912. Its totient is φ = 16830309888.

The previous prime is 18493408603. The next prime is 18493408651. The reversal of 18493408609 is 90680439481.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18493408609 - 2³ = 18493408601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18493408601) 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, 303762 + ... + 359524.

It is an arithmetic number, because the mean of its divisors is an integer number (1262385432).

Almost surely, 2^18493408609 is an apocalyptic number.

It is an amenable number.

18493408609 is a deficient number, since it is larger than the sum of its proper divisors (1704758303).

18493408609 is a wasteful number, since it uses less digits than its factorization.

18493408609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56136.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 18493408609 in words is "eighteen billion, four hundred ninety-three million, four hundred eight thousand, six hundred nine".