18723344559 has 16 divisors (see below), whose sum is σ = 25830138720. Its totient is φ = 12049551360.

The previous prime is 18723344539. The next prime is 18723344561. The reversal of 18723344559 is 95544332781.

It is not a de Polignac number, because 18723344559 - 2¹¹ = 18723342511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18723344539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534339 + ... + 568299.

It is an arithmetic number, because the mean of its divisors is an integer number (1614383670).

Almost surely, 2^18723344559 is an apocalyptic number.

18723344559 is a deficient number, since it is larger than the sum of its proper divisors (7106794161).

18723344559 is a wasteful number, since it uses less digits than its factorization.

18723344559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40330.

The product of its digits is 3628800, while the sum is 51.

The spelling of 18723344559 in words is "eighteen billion, seven hundred twenty-three million, three hundred forty-four thousand, five hundred fifty-nine".