18049318559 has 4 divisors (see below), whose sum is σ = 18050020560. Its totient is φ = 18048616560.

The previous prime is 18049318549. The next prime is 18049318589. The reversal of 18049318559 is 95581394081.

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 18049318559 - 2⁴ = 18049318543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18049318559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18049318519) 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, 310907 + ... + 364364.

It is an arithmetic number, because the mean of its divisors is an integer number (4512505140).

Almost surely, 2^18049318559 is an apocalyptic number.

18049318559 is a deficient number, since it is larger than the sum of its proper divisors (702001).

18049318559 is an equidigital number, since it uses as much as digits as its factorization.

18049318559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702000.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The spelling of 18049318559 in words is "eighteen billion, forty-nine million, three hundred eighteen thousand, five hundred fifty-nine".