25861585 has 4 divisors (see below), whose sum is σ = 31033908. Its totient is φ = 20689264.

The previous prime is 25861553. The next prime is 25861643. The reversal of 25861585 is 58516852.

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 6395841 + 19465744 = 2529^2 + 4412^2 .

It is a cyclic number.

It is not a de Polignac number, because 25861585 - 2⁵ = 25861553 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 2586154 + ... + 2586163.

It is an arithmetic number, because the mean of its divisors is an integer number (7758477).

Almost surely, 2^25861585 is an apocalyptic number.

It is an amenable number.

25861585 is a deficient number, since it is larger than the sum of its proper divisors (5172323).

25861585 is an equidigital number, since it uses as much as digits as its factorization.

25861585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5172322.

The product of its digits is 96000, while the sum is 40.

The square root of 25861585 is about 5085.4286938271. The cubic root of 25861585 is about 295.7229610526.

The spelling of 25861585 in words is "twenty-five million, eight hundred sixty-one thousand, five hundred eighty-five".