18005997489 has 8 divisors (see below), whose sum is σ = 24009084672. Its totient is φ = 12003454320.

The previous prime is 18005997487. The next prime is 18005997509. The reversal of 18005997489 is 98479950081.

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

It is not a de Polignac number, because 18005997489 - 2¹ = 18005997487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18005997481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51222 + ... + 196559.

It is an arithmetic number, because the mean of its divisors is an integer number (3001135584).

Almost surely, 2^18005997489 is an apocalyptic number.

It is an amenable number.

18005997489 is a deficient number, since it is larger than the sum of its proper divisors (6003087183).

18005997489 is a wasteful number, since it uses less digits than its factorization.

18005997489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272007.

The product of its (nonzero) digits is 6531840, while the sum is 60.

The spelling of 18005997489 in words is "eighteen billion, five million, nine hundred ninety-seven thousand, four hundred eighty-nine".