321905966604961 has 4 divisors (see below), whose sum is σ = 326439853458624. Its totient is φ = 317372079751300.

The previous prime is 321905966604947. The next prime is 321905966604973. The reversal of 321905966604961 is 169406669509123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321905966604961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321905966604931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2266943426725 + ... + 2266943426866.

It is an arithmetic number, because the mean of its divisors is an integer number (81609963364656).

Almost surely, 2^{321905966604961} is an apocalyptic number.

It is an amenable number.

321905966604961 is a deficient number, since it is larger than the sum of its proper divisors (4533886853663).

321905966604961 is an equidigital number, since it uses as much as digits as its factorization.

321905966604961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4533886853662.

The product of its (nonzero) digits is 113374080, while the sum is 67.

The spelling of 321905966604961 in words is "three hundred twenty-one trillion, nine hundred five billion, nine hundred sixty-six million, six hundred four thousand, nine hundred sixty-one".