18865656328 has 16 divisors (see below), whose sum is σ = 35503637760. Its totient is φ = 9398019600.

The previous prime is 18865656323. The next prime is 18865656331. The reversal of 18865656328 is 82365656881.

It is not an unprimeable number, because it can be changed into a prime (18865656323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4348768 + ... + 4353103.

It is an arithmetic number, because the mean of its divisors is an integer number (2218977360).

Almost surely, 2^18865656328 is an apocalyptic number.

It is an amenable number.

18865656328 is a deficient number, since it is larger than the sum of its proper divisors (16637981432).

18865656328 is a wasteful number, since it uses less digits than its factorization.

18865656328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8702148 (or 8702144 counting only the distinct ones).

The product of its digits is 16588800, while the sum is 58.

The spelling of 18865656328 in words is "eighteen billion, eight hundred sixty-five million, six hundred fifty-six thousand, three hundred twenty-eight".