256159318656529 has 2 divisors, whose sum is σ = 256159318656530. Its totient is φ = 256159318656528.

The previous prime is 256159318656511. The next prime is 256159318656611. The reversal of 256159318656529 is 925656813951652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228438588214225 + 27720730442304 = 15114185^2 + 5265048^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256159318656529 is a prime.

It is not a weakly prime, because it can be changed into another prime (256159318656029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128079659328264 + 128079659328265.

It is an arithmetic number, because the mean of its divisors is an integer number (128079659328265).

Almost surely, 2^{256159318656529} is an apocalyptic number.

It is an amenable number.

256159318656529 is a deficient number, since it is larger than the sum of its proper divisors (1).

256159318656529 is an equidigital number, since it uses as much as digits as its factorization.

256159318656529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760000, while the sum is 73.

The spelling of 256159318656529 in words is "two hundred fifty-six trillion, one hundred fifty-nine billion, three hundred eighteen million, six hundred fifty-six thousand, five hundred twenty-nine".