256166041 has 4 divisors (see below), whose sum is σ = 257284900. Its totient is φ = 255047184.

The previous prime is 256166021. The next prime is 256166087. The reversal of 256166041 is 140661652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 240126016 + 16040025 = 15496^2 + 4005^2 .

It is a cyclic number.

It is not a de Polignac number, because 256166041 - 2⁹ = 256165529 is a prime.

It is a super-2 number, since 2×256166041² = 131242081123227362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256165994 and 256166012.

It is not an unprimeable number, because it can be changed into a prime (256166011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559086 + ... + 559543.

It is an arithmetic number, because the mean of its divisors is an integer number (64321225).

Almost surely, 2^256166041 is an apocalyptic number.

It is an amenable number.

256166041 is a deficient number, since it is larger than the sum of its proper divisors (1118859).

256166041 is a wasteful number, since it uses less digits than its factorization.

256166041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118858.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 256166041 is about 16005.1879401649. The cubic root of 256166041 is about 635.0976690655.

The spelling of 256166041 in words is "two hundred fifty-six million, one hundred sixty-six thousand, forty-one".