256500535555291 has 2 divisors, whose sum is σ = 256500535555292. Its totient is φ = 256500535555290.

The previous prime is 256500535555181. The next prime is 256500535555333. The reversal of 256500535555291 is 192555535005652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256500535555291 - 2²³ = 256500527166683 is a prime.

It is a super-2 number, since 2×256500535555291² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256500535525291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128250267777645 + 128250267777646.

It is an arithmetic number, because the mean of its divisors is an integer number (128250267777646).

Almost surely, 2^{256500535555291} is an apocalyptic number.

256500535555291 is a deficient number, since it is larger than the sum of its proper divisors (1).

256500535555291 is an equidigital number, since it uses as much as digits as its factorization.

256500535555291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50625000, while the sum is 58.

The spelling of 256500535555291 in words is "two hundred fifty-six trillion, five hundred billion, five hundred thirty-five million, five hundred fifty-five thousand, two hundred ninety-one".