256646321466 has 16 divisors (see below), whose sum is σ = 530992389600. Its totient is φ = 82598816048.

The previous prime is 256646321453. The next prime is 256646321471. The reversal of 256646321466 is 664123646652.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 737489256 + ... + 737489603.

It is an arithmetic number, because the mean of its divisors is an integer number (33187024350).

Almost surely, 2^256646321466 is an apocalyptic number.

256646321466 is an abundant number, since it is smaller than the sum of its proper divisors (274346068134).

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

256646321466 is a wasteful number, since it uses less digits than its factorization.

256646321466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474978893.

The product of its digits is 7464960, while the sum is 51.

The spelling of 256646321466 in words is "two hundred fifty-six billion, six hundred forty-six million, three hundred twenty-one thousand, four hundred sixty-six".