256343744447703 has 36 divisors (see below), whose sum is σ = 406998361453320. Its totient is φ = 155358835088160.

The previous prime is 256343744447647. The next prime is 256343744447719. The reversal of 256343744447703 is 307744447343652.

It is a happy number.

256343744447703 is a `hidden beast` number, since 2 + 56 + 3 + 4 + 3 + 74 + 4 + 447 + 70 + 3 = 666.

It is not a de Polignac number, because 256343744447703 - 2²⁶ = 256343677338839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256343744447003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 188244553 + ... + 189601421.

It is an arithmetic number, because the mean of its divisors is an integer number (11305510040370).

Almost surely, 2^{256343744447703} is an apocalyptic number.

256343744447703 is a deficient number, since it is larger than the sum of its proper divisors (150654617005617).

256343744447703 is a wasteful number, since it uses less digits than its factorization.

256343744447703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530380 (or 1530366 counting only the distinct ones).

The product of its (nonzero) digits is 568995840, while the sum is 63.

The spelling of 256343744447703 in words is "two hundred fifty-six trillion, three hundred forty-three billion, seven hundred forty-four million, four hundred forty-seven thousand, seven hundred three".