18008317499 has 4 divisors (see below), whose sum is σ = 18137873880. Its totient is φ = 17878761120.

The previous prime is 18008317487. The next prime is 18008317519. The reversal of 18008317499 is 99471380081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18008317499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18008317699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64777982 + ... + 64778259.

It is an arithmetic number, because the mean of its divisors is an integer number (4534468470).

Almost surely, 2^18008317499 is an apocalyptic number.

18008317499 is a deficient number, since it is larger than the sum of its proper divisors (129556381).

18008317499 is a wasteful number, since it uses less digits than its factorization.

18008317499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129556380.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 18008317499 in words is "eighteen billion, eight million, three hundred seventeen thousand, four hundred ninety-nine".