25612565 has 16 divisors (see below), whose sum is σ = 33635520. Its totient is φ = 18568320.

The previous prime is 25612537. The next prime is 25612607. The reversal of 25612565 is 56521652.

It is not a de Polignac number, because 25612565 - 2⁸ = 25612309 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24626 + ... + 25644.

It is an arithmetic number, because the mean of its divisors is an integer number (2102220).

Almost surely, 2^25612565 is an apocalyptic number.

It is an amenable number.

25612565 is a deficient number, since it is larger than the sum of its proper divisors (8022955).

25612565 is a wasteful number, since it uses less digits than its factorization.

25612565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492.

The product of its digits is 18000, while the sum is 32.

The square root of 25612565 is about 5060.8857920329. The cubic root of 25612565 is about 294.7707306043.

It can be divided in two parts, 256 and 12565, that added together give a palindrome (12821).

The spelling of 25612565 in words is "twenty-five million, six hundred twelve thousand, five hundred sixty-five".