18189380309 has 4 divisors (see below), whose sum is σ = 18332603904. Its totient is φ = 18046156716.

The previous prime is 18189380239. The next prime is 18189380311. The reversal of 18189380309 is 90308398181.

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 a de Polignac number, because none of the positive numbers 2^k-18189380309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18189380399) 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 3 ways as a sum of consecutive naturals, for example, 71611607 + ... + 71611860.

It is an arithmetic number, because the mean of its divisors is an integer number (4583150976).

Almost surely, 2^18189380309 is an apocalyptic number.

It is an amenable number.

18189380309 is a deficient number, since it is larger than the sum of its proper divisors (143223595).

18189380309 is a wasteful number, since it uses less digits than its factorization.

18189380309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143223594.

The product of its (nonzero) digits is 373248, while the sum is 50.

The spelling of 18189380309 in words is "eighteen billion, one hundred eighty-nine million, three hundred eighty thousand, three hundred nine".