18318259553 has 8 divisors (see below), whose sum is σ = 20281818720. Its totient is φ = 16404410880.

The previous prime is 18318259529. The next prime is 18318259571. The reversal of 18318259553 is 35595281381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18318259553 - 2¹² = 18318255457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18318259573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12426848 + ... + 12428321.

It is an arithmetic number, because the mean of its divisors is an integer number (2535227340).

Almost surely, 2^18318259553 is an apocalyptic number.

It is an amenable number.

18318259553 is a deficient number, since it is larger than the sum of its proper divisors (1963559167).

18318259553 is a wasteful number, since it uses less digits than its factorization.

18318259553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24855247.

The product of its digits is 1296000, while the sum is 50.

The spelling of 18318259553 in words is "eighteen billion, three hundred eighteen million, two hundred fifty-nine thousand, five hundred fifty-three".