25590565 has 32 divisors (see below), whose sum is σ = 41239296. Its totient is φ = 14722560.

The previous prime is 25590563. The next prime is 25590589. The reversal of 25590565 is 56509552.

It is not a de Polignac number, because 25590565 - 2¹ = 25590563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25590563) 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 31 ways as a sum of consecutive naturals, for example, 2449 + ... + 7561.

It is an arithmetic number, because the mean of its divisors is an integer number (1288728).

Almost surely, 2^25590565 is an apocalyptic number.

It is an amenable number.

25590565 is a deficient number, since it is larger than the sum of its proper divisors (15648731).

25590565 is a wasteful number, since it uses less digits than its factorization.

25590565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5149.

The product of its (nonzero) digits is 67500, while the sum is 37.

The square root of 25590565 is about 5058.7117925417. The cubic root of 25590565 is about 294.6863083201.

It can be divided in two parts, 255905 and 65, that added together give a triangular number (255970 = T₇₁₅).

The spelling of 25590565 in words is "twenty-five million, five hundred ninety thousand, five hundred sixty-five".