256361014330261 has 2 divisors, whose sum is σ = 256361014330262. Its totient is φ = 256361014330260.

The previous prime is 256361014330243. The next prime is 256361014330319. The reversal of 256361014330261 is 162033410163652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248408648170225 + 7952366160036 = 15760985^2 + 2819994^2 .

It is a cyclic number.

It is not a de Polignac number, because 256361014330261 - 2⁵ = 256361014330229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256361014330961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128180507165130 + 128180507165131.

It is an arithmetic number, because the mean of its divisors is an integer number (128180507165131).

Almost surely, 2^{256361014330261} is an apocalyptic number.

It is an amenable number.

256361014330261 is a deficient number, since it is larger than the sum of its proper divisors (1).

256361014330261 is an equidigital number, since it uses as much as digits as its factorization.

256361014330261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 256361014330261 in words is "two hundred fifty-six trillion, three hundred sixty-one billion, fourteen million, three hundred thirty thousand, two hundred sixty-one".