256542708959 has 2 divisors, whose sum is σ = 256542708960. Its totient is φ = 256542708958.

The previous prime is 256542708953. The next prime is 256542708997. The reversal of 256542708959 is 959807245652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256542708959 - 2⁸ = 256542708703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256542708953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128271354479 + 128271354480.

It is an arithmetic number, because the mean of its divisors is an integer number (128271354480).

Almost surely, 2^256542708959 is an apocalyptic number.

256542708959 is a deficient number, since it is larger than the sum of its proper divisors (1).

256542708959 is an equidigital number, since it uses as much as digits as its factorization.

256542708959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432000, while the sum is 62.

The spelling of 256542708959 in words is "two hundred fifty-six billion, five hundred forty-two million, seven hundred eight thousand, nine hundred fifty-nine".