18730344489 has 4 divisors (see below), whose sum is σ = 24973792656. Its totient is φ = 12486896324.

The previous prime is 18730344443. The next prime is 18730344497. The reversal of 18730344489 is 98444303781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18730344489 - 2⁸ = 18730344233 is a prime.

It is a super-2 number, since 2×18730344489² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18730344089) 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, 3121724079 + ... + 3121724084.

It is an arithmetic number, because the mean of its divisors is an integer number (6243448164).

Almost surely, 2^18730344489 is an apocalyptic number.

It is an amenable number.

18730344489 is a deficient number, since it is larger than the sum of its proper divisors (6243448167).

18730344489 is an equidigital number, since it uses as much as digits as its factorization.

18730344489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6243448166.

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 18730344489 in words is "eighteen billion, seven hundred thirty million, three hundred forty-four thousand, four hundred eighty-nine".