25504565 has 4 divisors (see below), whose sum is σ = 30605484. Its totient is φ = 20403648.

The previous prime is 25504541. The next prime is 25504613. The reversal of 25504565 is 56540552.

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 13712209 + 11792356 = 3703^2 + 3434^2 .

It is a cyclic number.

It is not a de Polignac number, because 25504565 - 2¹⁴ = 25488181 is a prime.

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, 2550452 + ... + 2550461.

It is an arithmetic number, because the mean of its divisors is an integer number (7651371).

Almost surely, 2^25504565 is an apocalyptic number.

It is an amenable number.

25504565 is a deficient number, since it is larger than the sum of its proper divisors (5100919).

25504565 is an equidigital number, since it uses as much as digits as its factorization.

25504565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100918.

The product of its (nonzero) digits is 30000, while the sum is 32.

The square root of 25504565 is about 5050.2044513069. The cubic root of 25504565 is about 294.3558289031.

The spelling of 25504565 in words is "twenty-five million, five hundred four thousand, five hundred sixty-five".