256510041617539 has 2 divisors, whose sum is σ = 256510041617540. Its totient is φ = 256510041617538.

The previous prime is 256510041617447. The next prime is 256510041617563. The reversal of 256510041617539 is 935716140015652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256510041617539 - 2¹⁷ = 256510041486467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256510041617539.

It is not a weakly prime, because it can be changed into another prime (256510041617569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128255020808769 + 128255020808770.

It is an arithmetic number, because the mean of its divisors is an integer number (128255020808770).

Almost surely, 2^{256510041617539} is an apocalyptic number.

256510041617539 is a deficient number, since it is larger than the sum of its proper divisors (1).

256510041617539 is an equidigital number, since it uses as much as digits as its factorization.

256510041617539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804000, while the sum is 55.

The spelling of 256510041617539 in words is "two hundred fifty-six trillion, five hundred ten billion, forty-one million, six hundred seventeen thousand, five hundred thirty-nine".