391380664322 has 18 divisors (see below), whose sum is σ = 589567209147. Its totient is φ = 194861775024.

The previous prime is 391380664321. The next prime is 391380664349. The reversal of 391380664322 is 223466083193.

It can be written as a sum of positive squares in 5 ways, for example, as 4458099361 + 386922564961 = 66769^2 + 622031^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=442369.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391380664321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 245071628 + ... + 245073224.

Almost surely, 2^391380664322 is an apocalyptic number.

391380664322 is a deficient number, since it is larger than the sum of its proper divisors (198186544825).

391380664322 is an frugal number, since it uses more digits than its factorization.

391380664322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3750 (or 1876 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 47.

The spelling of 391380664322 in words is "three hundred ninety-one billion, three hundred eighty million, six hundred sixty-four thousand, three hundred twenty-two".