25011565 has 4 divisors (see below), whose sum is σ = 30013884. Its totient is φ = 20009248.

The previous prime is 25011559. The next prime is 25011611. The reversal of 25011565 is 56511052.

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 5669161 + 19342404 = 2381^2 + 4398^2 .

It is a cyclic number.

It is not a de Polignac number, because 25011565 - 2⁹ = 25011053 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, 2501152 + ... + 2501161.

It is an arithmetic number, because the mean of its divisors is an integer number (7503471).

Almost surely, 2^25011565 is an apocalyptic number.

It is an amenable number.

25011565 is a deficient number, since it is larger than the sum of its proper divisors (5002319).

25011565 is an equidigital number, since it uses as much as digits as its factorization.

25011565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5002318.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 25011565 is about 5001.1563662817. The cubic root of 25011565 is about 292.4468552240.

The spelling of 25011565 in words is "twenty-five million, eleven thousand, five hundred sixty-five".