18081374089 has 9 divisors (see below), whose sum is σ = 18480729031. Its totient is φ = 17690478520.

The previous prime is 18081374057. The next prime is 18081374099. The reversal of 18081374089 is 98047318081.

The square root of 18081374089 is 134467.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10106884089 + 7974490000 = 100533^2 + 89300^2 .

It is not a de Polignac number, because 18081374089 - 2⁵ = 18081374057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18081374099) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6318519 + ... + 6321379.

Almost surely, 2^18081374089 is an apocalyptic number.

18081374089 is the 134467-th square number.

18081374089 is the 67234-th centered octagonal number.

It is an amenable number.

18081374089 is a deficient number, since it is larger than the sum of its proper divisors (399354942).

18081374089 is an frugal number, since it uses more digits than its factorization.

18081374089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5816 (or 2908 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 49.

Multiplying 18081374089 by its sum of digits (49), we get a square (885987330361 = 941269²).

The spelling of 18081374089 in words is "eighteen billion, eighty-one million, three hundred seventy-four thousand, eighty-nine".