256540245223 has 2 divisors, whose sum is σ = 256540245224. Its totient is φ = 256540245222.

The previous prime is 256540245193. The next prime is 256540245289. The reversal of 256540245223 is 322542045652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256540245223 - 2⁹ = 256540244711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256540245023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128270122611 + 128270122612.

It is an arithmetic number, because the mean of its divisors is an integer number (128270122612).

Almost surely, 2^256540245223 is an apocalyptic number.

256540245223 is a deficient number, since it is larger than the sum of its proper divisors (1).

256540245223 is an equidigital number, since it uses as much as digits as its factorization.

256540245223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576000, while the sum is 40.

The spelling of 256540245223 in words is "two hundred fifty-six billion, five hundred forty million, two hundred forty-five thousand, two hundred twenty-three".