668232618 has 16 divisors (see below), whose sum is σ = 1341191136. Its totient is φ = 221956560.

The previous prime is 668232589. The next prime is 668232623. The reversal of 668232618 is 816232866.

It is a self number, because there is not a number n which added to its sum of digits gives 668232618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195073 + ... + 198468.

It is an arithmetic number, because the mean of its divisors is an integer number (83824446).

Almost surely, 2^668232618 is an apocalyptic number.

668232618 is an abundant number, since it is smaller than the sum of its proper divisors (672958518).

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

668232618 is a wasteful number, since it uses less digits than its factorization.

668232618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393829.

The product of its digits is 165888, while the sum is 42.

The square root of 668232618 is about 25850.1957052553. The cubic root of 668232618 is about 874.2639221316.

The spelling of 668232618 in words is "six hundred sixty-eight million, two hundred thirty-two thousand, six hundred eighteen".