256122980668 has 24 divisors (see below), whose sum is σ = 457923520880. Its totient is φ = 125309445120.

The previous prime is 256122980639. The next prime is 256122980699. The reversal of 256122980668 is 866089221652.

256122980668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2672298 + ... + 2766481.

Almost surely, 2^256122980668 is an apocalyptic number.

It is an amenable number.

256122980668 is a deficient number, since it is larger than the sum of its proper divisors (201800540212).

256122980668 is a wasteful number, since it uses less digits than its factorization.

256122980668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5439037 (or 5439035 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 256122980668 in words is "two hundred fifty-six billion, one hundred twenty-two million, nine hundred eighty thousand, six hundred sixty-eight".