18017985599 has 4 divisors (see below), whose sum is σ = 18032792064. Its totient is φ = 18003179136.

The previous prime is 18017985577. The next prime is 18017985641. The reversal of 18017985599 is 99558971081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99558971081 = 971 ⋅102532411.

It is a cyclic number.

It is not a de Polignac number, because 18017985599 - 2⁸ = 18017985343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18017985539) 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, 7401407 + ... + 7403840.

It is an arithmetic number, because the mean of its divisors is an integer number (4508198016).

Almost surely, 2^18017985599 is an apocalyptic number.

18017985599 is a deficient number, since it is larger than the sum of its proper divisors (14806465).

18017985599 is a wasteful number, since it uses less digits than its factorization.

18017985599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14806464.

The product of its (nonzero) digits is 8164800, while the sum is 62.

The spelling of 18017985599 in words is "eighteen billion, seventeen million, nine hundred eighty-five thousand, five hundred ninety-nine".