256460507617 has 2 divisors, whose sum is σ = 256460507618. Its totient is φ = 256460507616.

The previous prime is 256460507603. The next prime is 256460507671. The reversal of 256460507617 is 716705064652.

Together with next prime (256460507671) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128318702656 + 128141804961 = 358216^2 + 357969^2 .

It is a cyclic number.

It is not a de Polignac number, because 256460507617 - 2¹¹ = 256460505569 is a prime.

It is not a weakly prime, because it can be changed into another prime (256460507687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128230253808 + 128230253809.

It is an arithmetic number, because the mean of its divisors is an integer number (128230253809).

Almost surely, 2^256460507617 is an apocalyptic number.

It is an amenable number.

256460507617 is a deficient number, since it is larger than the sum of its proper divisors (1).

256460507617 is an equidigital number, since it uses as much as digits as its factorization.

256460507617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 256460507617 in words is "two hundred fifty-six billion, four hundred sixty million, five hundred seven thousand, six hundred seventeen".