256822742834741 has 2 divisors, whose sum is σ = 256822742834742. Its totient is φ = 256822742834740.

The previous prime is 256822742834711. The next prime is 256822742834849. The reversal of 256822742834741 is 147438247228652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193835170900900 + 62987571933841 = 13922470^2 + 7936471^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256822742834741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256822742834711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128411371417370 + 128411371417371.

It is an arithmetic number, because the mean of its divisors is an integer number (128411371417371).

Almost surely, 2^{256822742834741} is an apocalyptic number.

It is an amenable number.

256822742834741 is a deficient number, since it is larger than the sum of its proper divisors (1).

256822742834741 is an equidigital number, since it uses as much as digits as its factorization.

256822742834741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 289013760, while the sum is 65.

The spelling of 256822742834741 in words is "two hundred fifty-six trillion, eight hundred twenty-two billion, seven hundred forty-two million, eight hundred thirty-four thousand, seven hundred forty-one".