321316664 has 16 divisors (see below), whose sum is σ = 603470400. Its totient is φ = 160391232.

The previous prime is 321316603. The next prime is 321316691. The reversal of 321316664 is 466613123.

It is a self number, because there is not a number n which added to its sum of digits gives 321316664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28229 + ... + 37940.

It is an arithmetic number, because the mean of its divisors is an integer number (37716900).

Almost surely, 2^321316664 is an apocalyptic number.

It is an amenable number.

321316664 is a deficient number, since it is larger than the sum of its proper divisors (282153736).

321316664 is a wasteful number, since it uses less digits than its factorization.

321316664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66782 (or 66778 counting only the distinct ones).

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

The square root of 321316664 is about 17925.3079192520. The cubic root of 321316664 is about 684.9272048667.

Adding to 321316664 its reverse (466613123), we get a palindrome (787929787).

The spelling of 321316664 in words is "three hundred twenty-one million, three hundred sixteen thousand, six hundred sixty-four".