256666923359 has 16 divisors (see below), whose sum is σ = 320012501760. Its totient is φ = 199992586560.

The previous prime is 256666923353. The next prime is 256666923371. The reversal of 256666923359 is 953329666652.

It is a cyclic number.

It is not a de Polignac number, because 256666923359 - 2¹² = 256666919263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256666923353) 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, 2814827 + ... + 2904579.

It is an arithmetic number, because the mean of its divisors is an integer number (20000781360).

Almost surely, 2^256666923359 is an apocalyptic number.

256666923359 is a deficient number, since it is larger than the sum of its proper divisors (63345578401).

256666923359 is a wasteful number, since it uses less digits than its factorization.

256666923359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126910.

The product of its digits is 94478400, while the sum is 62.

The spelling of 256666923359 in words is "two hundred fifty-six billion, six hundred sixty-six million, nine hundred twenty-three thousand, three hundred fifty-nine".