321664163 has 8 divisors (see below), whose sum is σ = 328379280. Its totient is φ = 314995680.

The previous prime is 321664139. The next prime is 321664169. The reversal of 321664163 is 361466123.

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

It is a cyclic number.

It is not a de Polignac number, because 321664163 - 2⁸ = 321663907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321664169) 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 7 ways as a sum of consecutive naturals, for example, 2456 + ... + 25482.

It is an arithmetic number, because the mean of its divisors is an integer number (41047410).

Almost surely, 2^321664163 is an apocalyptic number.

321664163 is a deficient number, since it is larger than the sum of its proper divisors (6715117).

321664163 is a wasteful number, since it uses less digits than its factorization.

321664163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23317.

The product of its digits is 15552, while the sum is 32.

The square root of 321664163 is about 17934.9982715360. The cubic root of 321664163 is about 685.1740286338.

The spelling of 321664163 in words is "three hundred twenty-one million, six hundred sixty-four thousand, one hundred sixty-three".