25139565 has 96 divisors (see below), whose sum is σ = 52348800. Its totient is φ = 11547360.

The previous prime is 25139561. The next prime is 25139567. The reversal of 25139565 is 56593152.

25139565 = 5² + 6² + ... + 422².

It is not a de Polignac number, because 25139565 - 2² = 25139561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25139561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1323126 + ... + 1323144.

It is an arithmetic number, because the mean of its divisors is an integer number (545300).

Almost surely, 2^25139565 is an apocalyptic number.

It is an amenable number.

25139565 is an abundant number, since it is smaller than the sum of its proper divisors (27209235).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25139565 is an equidigital number, since it uses as much as digits as its factorization.

25139565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67 (or 38 counting only the distinct ones).

The product of its digits is 40500, while the sum is 36.

The square root of 25139565 is about 5013.9370757918. The cubic root of 25139565 is about 292.9448851280.

The spelling of 25139565 in words is "twenty-five million, one hundred thirty-nine thousand, five hundred sixty-five".