326880865721 has 2 divisors, whose sum is σ = 326880865722. Its totient is φ = 326880865720.

The previous prime is 326880865693. The next prime is 326880865769. The reversal of 326880865721 is 127568088623.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 325441725625 + 1439140096 = 570475^2 + 37936^2 .

It is a cyclic number.

It is not a de Polignac number, because 326880865721 - 2⁶ = 326880865657 is a prime.

It is a super-2 number, since 2×326880865721² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (326880865771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163440432860 + 163440432861.

It is an arithmetic number, because the mean of its divisors is an integer number (163440432861).

Almost surely, 2^326880865721 is an apocalyptic number.

It is an amenable number.

326880865721 is a deficient number, since it is larger than the sum of its proper divisors (1).

326880865721 is an equidigital number, since it uses as much as digits as its factorization.

326880865721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 326880865721 in words is "three hundred twenty-six billion, eight hundred eighty million, eight hundred sixty-five thousand, seven hundred twenty-one".