18189509038 has 4 divisors (see below), whose sum is σ = 27284263560. Its totient is φ = 9094754518.

The previous prime is 18189509029. The next prime is 18189509081. The reversal of 18189509038 is 83090598181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83090598181 = 1123 ⋅73989847.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4547377258 + ... + 4547377261.

It is an arithmetic number, because the mean of its divisors is an integer number (6821065890).

Almost surely, 2^18189509038 is an apocalyptic number.

18189509038 is a deficient number, since it is larger than the sum of its proper divisors (9094754522).

18189509038 is an equidigital number, since it uses as much as digits as its factorization.

18189509038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9094754521.

The product of its (nonzero) digits is 622080, while the sum is 52.

The spelling of 18189509038 in words is "eighteen billion, one hundred eighty-nine million, five hundred nine thousand, thirty-eight".