256163165 has 4 divisors (see below), whose sum is σ = 307395804. Its totient is φ = 204930528.

The previous prime is 256163153. The next prime is 256163183. The reversal of 256163165 is 561361652.

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 28334329 + 227828836 = 5323^2 + 15094^2 .

It is a cyclic number.

It is not a de Polignac number, because 256163165 - 2¹⁶ = 256097629 is a prime.

It is a Duffinian number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 25616312 + ... + 25616321.

It is an arithmetic number, because the mean of its divisors is an integer number (76848951).

Almost surely, 2^256163165 is an apocalyptic number.

It is an amenable number.

256163165 is a deficient number, since it is larger than the sum of its proper divisors (51232639).

256163165 is an equidigital number, since it uses as much as digits as its factorization.

256163165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51232638.

The product of its digits is 32400, while the sum is 35.

The square root of 256163165 is about 16005.0980940449. The cubic root of 256163165 is about 635.0952922897.

The spelling of 256163165 in words is "two hundred fifty-six million, one hundred sixty-three thousand, one hundred sixty-five".