25507565 has 8 divisors (see below), whose sum is σ = 32409720. Its totient is φ = 19205632.

The previous prime is 25507423. The next prime is 25507567. The reversal of 25507565 is 56570552.

It can be written as a sum of positive squares in 4 ways, for example, as 5410276 + 20097289 = 2326^2 + 4483^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25507565 - 2¹⁴ = 25491181 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25507567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149960 + ... + 150129.

It is an arithmetic number, because the mean of its divisors is an integer number (4051215).

Almost surely, 2^25507565 is an apocalyptic number.

It is an amenable number.

25507565 is a deficient number, since it is larger than the sum of its proper divisors (6902155).

25507565 is a wasteful number, since it uses less digits than its factorization.

25507565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300111.

The product of its (nonzero) digits is 52500, while the sum is 35.

The square root of 25507565 is about 5050.5014602512. The cubic root of 25507565 is about 294.3673697504.

The spelling of 25507565 in words is "twenty-five million, five hundred seven thousand, five hundred sixty-five".