18080543489 has 4 divisors (see below), whose sum is σ = 18084195924. Its totient is φ = 18076891056.

The previous prime is 18080543483. The next prime is 18080543513. The reversal of 18080543489 is 98434508081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16853232400 + 1227311089 = 129820^2 + 35033^2 .

It is a cyclic number.

It is not a de Polignac number, because 18080543489 - 2⁴ = 18080543473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18080543483) 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, 1818782 + ... + 1828695.

It is an arithmetic number, because the mean of its divisors is an integer number (4521048981).

Almost surely, 2^18080543489 is an apocalyptic number.

It is an amenable number.

18080543489 is a deficient number, since it is larger than the sum of its proper divisors (3652435).

18080543489 is an equidigital number, since it uses as much as digits as its factorization.

18080543489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3652434.

The product of its (nonzero) digits is 1105920, while the sum is 50.

The spelling of 18080543489 in words is "eighteen billion, eighty million, five hundred forty-three thousand, four hundred eighty-nine".