321905966604889 has 2 divisors, whose sum is σ = 321905966604890. Its totient is φ = 321905966604888.

The previous prime is 321905966604881. The next prime is 321905966604917. The reversal of 321905966604889 is 988406669509123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286427360947225 + 35478605657664 = 16924165^2 + 5956392^2 .

It is a cyclic number.

It is not a de Polignac number, because 321905966604889 - 2³ = 321905966604881 is a prime.

It is not a weakly prime, because it can be changed into another prime (321905966604881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160952983302444 + 160952983302445.

It is an arithmetic number, because the mean of its divisors is an integer number (160952983302445).

Almost surely, 2^{321905966604889} is an apocalyptic number.

It is an amenable number.

321905966604889 is a deficient number, since it is larger than the sum of its proper divisors (1).

321905966604889 is an equidigital number, since it uses as much as digits as its factorization.

321905966604889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209323520, while the sum is 76.

The spelling of 321905966604889 in words is "three hundred twenty-one trillion, nine hundred five billion, nine hundred sixty-six million, six hundred four thousand, eight hundred eighty-nine".