18909731562 has 16 divisors (see below), whose sum is σ = 38841611232. Its totient is φ = 6132885840.

The previous prime is 18909731521. The next prime is 18909731579. The reversal of 18909731562 is 26513790981.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 42589264 + ... + 42589707.

It is an arithmetic number, because the mean of its divisors is an integer number (2427600702).

Almost surely, 2^18909731562 is an apocalyptic number.

18909731562 is an abundant number, since it is smaller than the sum of its proper divisors (19931879670).

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

18909731562 is a wasteful number, since it uses less digits than its factorization.

18909731562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85179013.

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 18909731562 in words is "eighteen billion, nine hundred nine million, seven hundred thirty-one thousand, five hundred sixty-two".