256743503712767 has 2 divisors, whose sum is σ = 256743503712768. Its totient is φ = 256743503712766.

The previous prime is 256743503712749. The next prime is 256743503712799. The reversal of 256743503712767 is 767217305347652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256743503712767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256743503712727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128371751856383 + 128371751856384.

It is an arithmetic number, because the mean of its divisors is an integer number (128371751856384).

Almost surely, 2^{256743503712767} is an apocalyptic number.

256743503712767 is a deficient number, since it is larger than the sum of its proper divisors (1).

256743503712767 is an equidigital number, since it uses as much as digits as its factorization.

256743503712767 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311169600, while the sum is 65.

The spelling of 256743503712767 in words is "two hundred fifty-six trillion, seven hundred forty-three billion, five hundred three million, seven hundred twelve thousand, seven hundred sixty-seven".