256560311600161 has 2 divisors, whose sum is σ = 256560311600162. Its totient is φ = 256560311600160.

The previous prime is 256560311600149. The next prime is 256560311600191. The reversal of 256560311600161 is 161006113065652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256558896711936 + 1414888225 = 16017456^2 + 37615^2 .

It is a cyclic number.

It is not a de Polignac number, because 256560311600161 - 2¹⁵ = 256560311567393 is a prime.

It is not a weakly prime, because it can be changed into another prime (256560311600141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128280155800080 + 128280155800081.

It is an arithmetic number, because the mean of its divisors is an integer number (128280155800081).

Almost surely, 2^{256560311600161} is an apocalyptic number.

It is an amenable number.

256560311600161 is a deficient number, since it is larger than the sum of its proper divisors (1).

256560311600161 is an equidigital number, since it uses as much as digits as its factorization.

256560311600161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 256560311600161 in words is "two hundred fifty-six trillion, five hundred sixty billion, three hundred eleven million, six hundred thousand, one hundred sixty-one".