256903226856 has 40 divisors (see below), whose sum is σ = 719566910370. Its totient is φ = 85634408736.

The previous prime is 256903226851. The next prime is 256903226863. The reversal of 256903226856 is 658622309652.

256903226856 is a `hidden beast` number, since 2 + 569 + 0 + 3 + 2 + 26 + 8 + 56 = 666.

It can be written as a sum of positive squares in only one way, i.e., 233839944900 + 23063281956 = 483570^2 + 151866^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (256903226851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 198227151 + ... + 198228446.

Almost surely, 2^256903226856 is an apocalyptic number.

It is an amenable number.

256903226856 is an abundant number, since it is smaller than the sum of its proper divisors (462663683514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256903226856 is a wasteful number, since it uses less digits than its factorization.

256903226856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396455615 (or 396455602 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 54.

The spelling of 256903226856 in words is "two hundred fifty-six billion, nine hundred three million, two hundred twenty-six thousand, eight hundred fifty-six".