25663265 has 4 divisors (see below), whose sum is σ = 30795924. Its totient is φ = 20530608.

The previous prime is 25663247. The next prime is 25663273. The reversal of 25663265 is 56236652.

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 18215824 + 7447441 = 4268^2 + 2729^2 .

It is a cyclic number.

It is not a de Polignac number, because 25663265 - 2¹⁶ = 25597729 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, 2566322 + ... + 2566331.

It is an arithmetic number, because the mean of its divisors is an integer number (7698981).

Almost surely, 2^25663265 is an apocalyptic number.

It is an amenable number.

25663265 is a deficient number, since it is larger than the sum of its proper divisors (5132659).

25663265 is an equidigital number, since it uses as much as digits as its factorization.

25663265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132658.

The product of its digits is 64800, while the sum is 35.

The square root of 25663265 is about 5065.8923202137. The cubic root of 25663265 is about 294.9651016842.

The spelling of 25663265 in words is "twenty-five million, six hundred sixty-three thousand, two hundred sixty-five".