25138565 has 4 divisors (see below), whose sum is σ = 30166284. Its totient is φ = 20110848.

The previous prime is 25138549. The next prime is 25138571. The reversal of 25138565 is 56583152.

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 11404129 + 13734436 = 3377^2 + 3706^2 .

It is a cyclic number.

It is not a de Polignac number, because 25138565 - 2⁴ = 25138549 is a prime.

It is a Duffinian 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, 2513852 + ... + 2513861.

It is an arithmetic number, because the mean of its divisors is an integer number (7541571).

Almost surely, 2^25138565 is an apocalyptic number.

It is an amenable number.

25138565 is a deficient number, since it is larger than the sum of its proper divisors (5027719).

25138565 is an equidigital number, since it uses as much as digits as its factorization.

25138565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027718.

The product of its digits is 36000, while the sum is 35.

The square root of 25138565 is about 5013.8373527668. The cubic root of 25138565 is about 292.9410008289.

The spelling of 25138565 in words is "twenty-five million, one hundred thirty-eight thousand, five hundred sixty-five".