25261865 has 4 divisors (see below), whose sum is σ = 30314244. Its totient is φ = 20209488.

The previous prime is 25261837. The next prime is 25261877. The reversal of 25261865 is 56816252.

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 19678096 + 5583769 = 4436^2 + 2363^2 .

It is a cyclic number.

It is not a de Polignac number, because 25261865 - 2¹⁰ = 25260841 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2526182 + ... + 2526191.

It is an arithmetic number, because the mean of its divisors is an integer number (7578561).

Almost surely, 2^25261865 is an apocalyptic number.

It is an amenable number.

25261865 is a deficient number, since it is larger than the sum of its proper divisors (5052379).

25261865 is an equidigital number, since it uses as much as digits as its factorization.

25261865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5052378.

The product of its digits is 28800, while the sum is 35.

The square root of 25261865 is about 5026.1182835266. The cubic root of 25261865 is about 293.4191603478.

The spelling of 25261865 in words is "twenty-five million, two hundred sixty-one thousand, eight hundred sixty-five".