18558418559 has 4 divisors (see below), whose sum is σ = 18558821904. Its totient is φ = 18558015216.

The previous prime is 18558418513. The next prime is 18558418579. The reversal of 18558418559 is 95581485581.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18558418559 - 2⁸ = 18558418303 is a prime.

It is a super-2 number, since 2×18558418559² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18558418498 and 18558418507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18558418579) 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, 122222 + ... + 228155.

It is an arithmetic number, because the mean of its divisors is an integer number (4639705476).

Almost surely, 2^18558418559 is an apocalyptic number.

18558418559 is a deficient number, since it is larger than the sum of its proper divisors (403345).

18558418559 is an equidigital number, since it uses as much as digits as its factorization.

18558418559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403344.

The product of its digits is 11520000, while the sum is 59.

The spelling of 18558418559 in words is "eighteen billion, five hundred fifty-eight million, four hundred eighteen thousand, five hundred fifty-nine".