256500352105243 has 16 divisors (see below), whose sum is σ = 265809852207360. Its totient is φ = 247221913881600.

The previous prime is 256500352105237. The next prime is 256500352105271. The reversal of 256500352105243 is 342501253005652.

It is a cyclic number.

It is not a de Polignac number, because 256500352105243 - 2¹³ = 256500352097051 is a prime.

It is a super-2 number, since 2×256500352105243² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256500352105243.

It is not an unprimeable number, because it can be changed into a prime (256500352105643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170369283 + ... + 171868243.

It is an arithmetic number, because the mean of its divisors is an integer number (16613115762960).

Almost surely, 2^{256500352105243} is an apocalyptic number.

256500352105243 is a deficient number, since it is larger than the sum of its proper divisors (9309500102117).

256500352105243 is a wasteful number, since it uses less digits than its factorization.

256500352105243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509318.

The product of its (nonzero) digits is 1080000, while the sum is 43.

The spelling of 256500352105243 in words is "two hundred fifty-six trillion, five hundred billion, three hundred fifty-two million, one hundred five thousand, two hundred forty-three".