256104565 has 8 divisors (see below), whose sum is σ = 315631800. Its totient is φ = 199346112.

The previous prime is 256104559. The next prime is 256104571. The reversal of 256104565 is 565401652.

It is an interprime number because it is at equal distance from previous prime (256104559) and next prime (256104571).

It can be written as a sum of positive squares in 4 ways, for example, as 71334916 + 184769649 = 8446^2 + 13593^2 .

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 256104565 - 2³ = 256104557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256104565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691990 + ... + 692359.

It is an arithmetic number, because the mean of its divisors is an integer number (39453975).

Almost surely, 2^256104565 is an apocalyptic number.

It is an amenable number.

256104565 is a deficient number, since it is larger than the sum of its proper divisors (59527235).

256104565 is a wasteful number, since it uses less digits than its factorization.

256104565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384391.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 256104565 is about 16003.2673226438. The cubic root of 256104565 is about 635.0468603689.

The spelling of 256104565 in words is "two hundred fifty-six million, one hundred four thousand, five hundred sixty-five".