18287905825 has 24 divisors (see below), whose sum is σ = 26617032512. Its totient is φ = 12201347520.

The previous prime is 18287905817. The next prime is 18287905849. The reversal of 18287905825 is 52850978281.

It is not a de Polignac number, because 18287905825 - 2³ = 18287905817 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1405719 + ... + 1418668.

Almost surely, 2^18287905825 is an apocalyptic number.

It is an amenable number.

18287905825 is a deficient number, since it is larger than the sum of its proper divisors (8329126687).

18287905825 is a wasteful number, since it uses less digits than its factorization.

18287905825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824441 (or 2824436 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 55.

The spelling of 18287905825 in words is "eighteen billion, two hundred eighty-seven million, nine hundred five thousand, eight hundred twenty-five".