25649565 has 8 divisors (see below), whose sum is σ = 41039328. Its totient is φ = 13679760.

The previous prime is 25649557. The next prime is 25649587. The reversal of 25649565 is 56594652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25649565 - 2³ = 25649557 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 854971 + ... + 855000.

It is an arithmetic number, because the mean of its divisors is an integer number (5129916).

Almost surely, 2^25649565 is an apocalyptic number.

It is an amenable number.

25649565 is a deficient number, since it is larger than the sum of its proper divisors (15389763).

25649565 is a wasteful number, since it uses less digits than its factorization.

25649565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709979.

The product of its digits is 324000, while the sum is 42.

The square root of 25649565 is about 5064.5399593645. The cubic root of 25649565 is about 294.9126045813.

The spelling of 25649565 in words is "twenty-five million, six hundred forty-nine thousand, five hundred sixty-five".