320640166 has 16 divisors (see below), whose sum is σ = 599639040. Its totient is φ = 124924680.

The previous prime is 320640149. The next prime is 320640209. The reversal of 320640166 is 661046023.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1040886 + ... + 1041193.

It is an arithmetic number, because the mean of its divisors is an integer number (37477440).

Almost surely, 2^320640166 is an apocalyptic number.

320640166 is a deficient number, since it is larger than the sum of its proper divisors (278998874).

320640166 is a wasteful number, since it uses less digits than its factorization.

320640166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2082099.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 320640166 is about 17906.4280636871. The cubic root of 320640166 is about 684.4461867139.

Adding to 320640166 its reverse (661046023), we get a palindrome (981686189).

The spelling of 320640166 in words is "three hundred twenty million, six hundred forty thousand, one hundred sixty-six".