25648565065 has 4 divisors (see below), whose sum is σ = 30778278084. Its totient is φ = 20518852048.

The previous prime is 25648565053. The next prime is 25648565093. The reversal of 25648565065 is 56056584652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12486051081 + 13162513984 = 111741^2 + 114728^2 .

It is a cyclic number.

It is not a de Polignac number, because 25648565065 - 2⁷ = 25648564937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2564856502 + ... + 2564856511.

It is an arithmetic number, because the mean of its divisors is an integer number (7694569521).

Almost surely, 2^25648565065 is an apocalyptic number.

It is an amenable number.

25648565065 is a deficient number, since it is larger than the sum of its proper divisors (5129713019).

25648565065 is an equidigital number, since it uses as much as digits as its factorization.

25648565065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5129713018.

The product of its (nonzero) digits is 8640000, while the sum is 52.

The spelling of 25648565065 in words is "twenty-five billion, six hundred forty-eight million, five hundred sixty-five thousand, sixty-five".