25270565 has 4 divisors (see below), whose sum is σ = 30324684. Its totient is φ = 20216448.

The previous prime is 25270547. The next prime is 25270579. The reversal of 25270565 is 56507252.

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 12432676 + 12837889 = 3526^2 + 3583^2 .

It is a cyclic number.

It is not a de Polignac number, because 25270565 - 2⁶ = 25270501 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 2527052 + ... + 2527061.

It is an arithmetic number, because the mean of its divisors is an integer number (7581171).

Almost surely, 2^25270565 is an apocalyptic number.

It is an amenable number.

25270565 is a deficient number, since it is larger than the sum of its proper divisors (5054119).

25270565 is an equidigital number, since it uses as much as digits as its factorization.

25270565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5054118.

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 25270565 is about 5026.9836880579. The cubic root of 25270565 is about 293.4528402800.

The spelling of 25270565 in words is "twenty-five million, two hundred seventy thousand, five hundred sixty-five".