16640568618 has 16 divisors (see below), whose sum is σ = 33336705600. Its totient is φ = 5537594816.

The previous prime is 16640568587. The next prime is 16640568641. The reversal of 16640568618 is 81686504661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2311455 + ... + 2318642.

It is an arithmetic number, because the mean of its divisors is an integer number (2083544100).

Almost surely, 2^16640568618 is an apocalyptic number.

16640568618 is an abundant number, since it is smaller than the sum of its proper divisors (16696136982).

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

16640568618 is a wasteful number, since it uses less digits than its factorization.

16640568618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630701.

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 16640568618 in words is "sixteen billion, six hundred forty million, five hundred sixty-eight thousand, six hundred eighteen".