256178251256 has 8 divisors (see below), whose sum is σ = 480334221120. Its totient is φ = 128089125624.

The previous prime is 256178251223. The next prime is 256178251289. The reversal of 256178251256 is 652152871652.

It is an interprime number because it is at equal distance from previous prime (256178251223) and next prime (256178251289).

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 16011140696 + ... + 16011140711.

It is an arithmetic number, because the mean of its divisors is an integer number (60041777640).

Almost surely, 2^256178251256 is an apocalyptic number.

It is an amenable number.

256178251256 is a deficient number, since it is larger than the sum of its proper divisors (224155969864).

256178251256 is a wasteful number, since it uses less digits than its factorization.

256178251256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32022281413 (or 32022281409 counting only the distinct ones).

The product of its digits is 2016000, while the sum is 50.

The spelling of 256178251256 in words is "two hundred fifty-six billion, one hundred seventy-eight million, two hundred fifty-one thousand, two hundred fifty-six".