25613565 has 16 divisors (see below), whose sum is σ = 41139456. Its totient is φ = 13608000.

The previous prime is 25613531. The next prime is 25613569. The reversal of 25613565 is 56531652.

It is not a de Polignac number, because 25613565 - 2⁸ = 25613309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25613569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915 + ... + 7215.

It is an arithmetic number, because the mean of its divisors is an integer number (2571216).

Almost surely, 2^25613565 is an apocalyptic number.

It is an amenable number.

25613565 is a deficient number, since it is larger than the sum of its proper divisors (15525891).

25613565 is a wasteful number, since it uses less digits than its factorization.

25613565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6580.

The product of its digits is 27000, while the sum is 33.

The square root of 25613565 is about 5060.9845880026. The cubic root of 25613565 is about 294.7745668320.

The spelling of 25613565 in words is "twenty-five million, six hundred thirteen thousand, five hundred sixty-five".