256111065 has 48 divisors (see below), whose sum is σ = 526151808. Its totient is φ = 117075456.

The previous prime is 256111043. The next prime is 256111073. The reversal of 256111065 is 560111652.

It is a happy number.

It is not a de Polignac number, because 256111065 - 2¹¹ = 256109017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

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 47 ways as a sum of consecutive naturals, for example, 6552 + ... + 23561.

It is an arithmetic number, because the mean of its divisors is an integer number (10961496).

Almost surely, 2^256111065 is an apocalyptic number.

It is an amenable number.

256111065 is an abundant number, since it is smaller than the sum of its proper divisors (270040743).

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

256111065 is an equidigital number, since it uses as much as digits as its factorization.

256111065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30140 (or 30128 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 256111065 is about 16003.4704048841. The cubic root of 256111065 is about 635.0522328745.

The spelling of 256111065 in words is "two hundred fifty-six million, one hundred eleven thousand, sixty-five".