18509238834 has 32 divisors (see below), whose sum is σ = 37099823040. Its totient is φ = 6156207552.

The previous prime is 18509238823. The next prime is 18509238859. The reversal of 18509238834 is 43883290581.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7471204 + ... + 7473680.

It is an arithmetic number, because the mean of its divisors is an integer number (1159369470).

Almost surely, 2^18509238834 is an apocalyptic number.

18509238834 is an abundant number, since it is smaller than the sum of its proper divisors (18590584206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18509238834 is a wasteful number, since it uses less digits than its factorization.

18509238834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4714.

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 18509238834 in words is "eighteen billion, five hundred nine million, two hundred thirty-eight thousand, eight hundred thirty-four".