321091928665 has 16 divisors (see below), whose sum is σ = 394954483968. Its totient is φ = 250464807936.

The previous prime is 321091928627. The next prime is 321091928711. The reversal of 321091928665 is 566829190123.

It is a cyclic number.

It is not a de Polignac number, because 321091928665 - 2⁹ = 321091928153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1170097 + ... + 1418206.

It is an arithmetic number, because the mean of its divisors is an integer number (24684655248).

Almost surely, 2^321091928665 is an apocalyptic number.

It is an amenable number.

321091928665 is a deficient number, since it is larger than the sum of its proper divisors (73862555303).

321091928665 is a wasteful number, since it uses less digits than its factorization.

321091928665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588928.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 321091928665 in words is "three hundred twenty-one billion, ninety-one million, nine hundred twenty-eight thousand, six hundred sixty-five".