18118394559 has 24 divisors (see below), whose sum is σ = 26950303952. Its totient is φ = 11722838400.

The previous prime is 18118394519. The next prime is 18118394603. The reversal of 18118394559 is 95549381181.

It is a happy number.

18118394559 is a `hidden beast` number, since 1 + 8 + 1 + 1 + 83 + 9 + 4 + 559 = 666.

It is not a de Polignac number, because 18118394559 - 2⁷ = 18118394431 is a prime.

It is a super-3 number, since 3×18118394559³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18118394519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88342 + ... + 209859.

Almost surely, 2^18118394559 is an apocalyptic number.

18118394559 is a deficient number, since it is larger than the sum of its proper divisors (8831909393).

18118394559 is a wasteful number, since it uses less digits than its factorization.

18118394559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298407 (or 298404 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 54.

The spelling of 18118394559 in words is "eighteen billion, one hundred eighteen million, three hundred ninety-four thousand, five hundred fifty-nine".