256135801166 has 16 divisors (see below), whose sum is σ = 439892681856. Its totient is φ = 109571801976.

The previous prime is 256135801139. The next prime is 256135801193. The reversal of 256135801166 is 661108531652.

256135801166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (256135801139) and next prime (256135801193).

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, 16715756 + ... + 16731071.

It is an arithmetic number, because the mean of its divisors is an integer number (27493292616).

Almost surely, 2^256135801166 is an apocalyptic number.

256135801166 is a deficient number, since it is larger than the sum of its proper divisors (183756880690).

256135801166 is a wasteful number, since it uses less digits than its factorization.

256135801166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33447383.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 256135801166 in words is "two hundred fifty-six billion, one hundred thirty-five million, eight hundred one thousand, one hundred sixty-six".