18656351618 has 8 divisors (see below), whose sum is σ = 28042951680. Its totient is φ = 9308701060.

The previous prime is 18656351561. The next prime is 18656351621. The reversal of 18656351618 is 81615365681.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 9736178 + ... + 9738093.

It is an arithmetic number, because the mean of its divisors is an integer number (3505368960).

Almost surely, 2^18656351618 is an apocalyptic number.

18656351618 is a deficient number, since it is larger than the sum of its proper divisors (9386600062).

18656351618 is a wasteful number, since it uses less digits than its factorization.

18656351618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19474752.

The product of its digits is 1036800, while the sum is 50.

The spelling of 18656351618 in words is "eighteen billion, six hundred fifty-six million, three hundred fifty-one thousand, six hundred eighteen".