256510041617447 has 2 divisors, whose sum is σ = 256510041617448. Its totient is φ = 256510041617446.

The previous prime is 256510041617443. The next prime is 256510041617539. The reversal of 256510041617447 is 744716140015652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256510041617447 - 2² = 256510041617443 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256510041617443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128255020808723 + 128255020808724.

It is an arithmetic number, because the mean of its divisors is an integer number (128255020808724).

Almost surely, 2^{256510041617447} is an apocalyptic number.

256510041617447 is a deficient number, since it is larger than the sum of its proper divisors (1).

256510041617447 is an equidigital number, since it uses as much as digits as its factorization.

256510041617447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5644800, while the sum is 53.

The spelling of 256510041617447 in words is "two hundred fifty-six trillion, five hundred ten billion, forty-one million, six hundred seventeen thousand, four hundred forty-seven".