18408260664 has 32 divisors (see below), whose sum is σ = 51134058000. Its totient is φ = 6136086816.

The previous prime is 18408260641. The next prime is 18408260681. The reversal of 18408260664 is 46606280481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42611499 + ... + 42611930.

Almost surely, 2^18408260664 is an apocalyptic number.

It is an amenable number.

18408260664 is an abundant number, since it is smaller than the sum of its proper divisors (32725797336).

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

18408260664 is a wasteful number, since it uses less digits than its factorization.

18408260664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85223444 (or 85223434 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 18408260664 in words is "eighteen billion, four hundred eight million, two hundred sixty thousand, six hundred sixty-four".