256801723271 has 2 divisors, whose sum is σ = 256801723272. Its totient is φ = 256801723270.

The previous prime is 256801723237. The next prime is 256801723319. The reversal of 256801723271 is 172327108652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256801723271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256801723201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128400861635 + 128400861636.

It is an arithmetic number, because the mean of its divisors is an integer number (128400861636).

Almost surely, 2^256801723271 is an apocalyptic number.

256801723271 is a deficient number, since it is larger than the sum of its proper divisors (1).

256801723271 is an equidigital number, since it uses as much as digits as its factorization.

256801723271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 256801723271 in words is "two hundred fifty-six billion, eight hundred one million, seven hundred twenty-three thousand, two hundred seventy-one".