256902493678 has 16 divisors (see below), whose sum is σ = 388327102416. Its totient is φ = 127460286720.

The previous prime is 256902493667. The next prime is 256902493723. The reversal of 256902493678 is 876394209652.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3916600 + ... + 3981652.

It is an arithmetic number, because the mean of its divisors is an integer number (24270443901).

Almost surely, 2^256902493678 is an apocalyptic number.

256902493678 is a deficient number, since it is larger than the sum of its proper divisors (131424608738).

256902493678 is a wasteful number, since it uses less digits than its factorization.

256902493678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80259.

The product of its (nonzero) digits is 39191040, while the sum is 61.

The spelling of 256902493678 in words is "two hundred fifty-six billion, nine hundred two million, four hundred ninety-three thousand, six hundred seventy-eight".