256431544881 has 16 divisors (see below), whose sum is σ = 360424823040. Its totient is φ = 161722360080.

The previous prime is 256431544867. The next prime is 256431544883. The reversal of 256431544881 is 188445134652.

256431544881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256431544881 - 2³⁵ = 222071806513 is a prime.

It is a super-2 number, since 2×256431544881² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256431544883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3215895 + ... + 3294668.

It is an arithmetic number, because the mean of its divisors is an integer number (22526551440).

Almost surely, 2^256431544881 is an apocalyptic number.

It is an amenable number.

256431544881 is a deficient number, since it is larger than the sum of its proper divisors (103993278159).

256431544881 is a wasteful number, since it uses less digits than its factorization.

256431544881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6511276.

The product of its digits is 3686400, while the sum is 51.

The spelling of 256431544881 in words is "two hundred fifty-six billion, four hundred thirty-one million, five hundred forty-four thousand, eight hundred eighty-one".