256816867339 has 2 divisors, whose sum is σ = 256816867340. Its totient is φ = 256816867338.

The previous prime is 256816867327. The next prime is 256816867357. The reversal of 256816867339 is 933768618652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256816867339 - 2⁹ = 256816866827 is a prime.

It is not a weakly prime, because it can be changed into another prime (256816867369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128408433669 + 128408433670.

It is an arithmetic number, because the mean of its divisors is an integer number (128408433670).

Almost surely, 2^256816867339 is an apocalyptic number.

256816867339 is a deficient number, since it is larger than the sum of its proper divisors (1).

256816867339 is an equidigital number, since it uses as much as digits as its factorization.

256816867339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 64.

The spelling of 256816867339 in words is "two hundred fifty-six billion, eight hundred sixteen million, eight hundred sixty-seven thousand, three hundred thirty-nine".