321456589694161 has 2 divisors, whose sum is σ = 321456589694162. Its totient is φ = 321456589694160.

The previous prime is 321456589694129. The next prime is 321456589694173. The reversal of 321456589694161 is 161496985654123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225525456425025 + 95931133269136 = 15017505^2 + 9794444^2 .

It is a cyclic number.

It is not a de Polignac number, because 321456589694161 - 2⁵ = 321456589694129 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (321456589694861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160728294847080 + 160728294847081.

It is an arithmetic number, because the mean of its divisors is an integer number (160728294847081).

Almost surely, 2^{321456589694161} is an apocalyptic number.

It is an amenable number.

321456589694161 is a deficient number, since it is larger than the sum of its proper divisors (1).

321456589694161 is an equidigital number, since it uses as much as digits as its factorization.

321456589694161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 335923200, while the sum is 70.

The spelling of 321456589694161 in words is "three hundred twenty-one trillion, four hundred fifty-six billion, five hundred eighty-nine million, six hundred ninety-four thousand, one hundred sixty-one".