331646465321 has 2 divisors, whose sum is σ = 331646465322. Its totient is φ = 331646465320.

The previous prime is 331646465309. The next prime is 331646465323. The reversal of 331646465321 is 123564646133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243235389721 + 88411075600 = 493189^2 + 297340^2 .

It is a cyclic number.

It is not a de Polignac number, because 331646465321 - 2¹⁴ = 331646448937 is a prime.

Together with 331646465323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331646465323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165823232660 + 165823232661.

It is an arithmetic number, because the mean of its divisors is an integer number (165823232661).

Almost surely, 2^331646465321 is an apocalyptic number.

It is an amenable number.

331646465321 is a deficient number, since it is larger than the sum of its proper divisors (1).

331646465321 is an equidigital number, since it uses as much as digits as its factorization.

331646465321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 44.

The spelling of 331646465321 in words is "three hundred thirty-one billion, six hundred forty-six million, four hundred sixty-five thousand, three hundred twenty-one".