256165445 has 8 divisors (see below), whose sum is σ = 308509944. Its totient is φ = 204191424.

The previous prime is 256165423. The next prime is 256165451. The reversal of 256165445 is 544561652.

It can be written as a sum of positive squares in 4 ways, for example, as 38514436 + 217651009 = 6206^2 + 14753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256165445 - 2¹⁰ = 256164421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 256165399 and 256165408.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 91094 + ... + 93863.

It is an arithmetic number, because the mean of its divisors is an integer number (38563743).

Almost surely, 2^256165445 is an apocalyptic number.

It is an amenable number.

256165445 is a deficient number, since it is larger than the sum of its proper divisors (52344499).

256165445 is a wasteful number, since it uses less digits than its factorization.

256165445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185239.

The product of its digits is 144000, while the sum is 38.

The square root of 256165445 is about 16005.1693211912. The cubic root of 256165445 is about 635.0971765223.

The spelling of 256165445 in words is "two hundred fifty-six million, one hundred sixty-five thousand, four hundred forty-five".