25865565 has 24 divisors (see below), whose sum is σ = 45492384. Its totient is φ = 12540000.

The previous prime is 25865561. The next prime is 25865573. The reversal of 25865565 is 56556852.

It is not a de Polignac number, because 25865565 - 2² = 25865561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25865561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5311 + ... + 8940.

It is an arithmetic number, because the mean of its divisors is an integer number (1895516).

Almost surely, 2^25865565 is an apocalyptic number.

It is an amenable number.

25865565 is a deficient number, since it is larger than the sum of its proper divisors (19626819).

25865565 is a wasteful number, since it uses less digits than its factorization.

25865565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14281 (or 14270 counting only the distinct ones).

The product of its digits is 360000, while the sum is 42.

The square root of 25865565 is about 5085.8199928822. The cubic root of 25865565 is about 295.7381304891.

The spelling of 25865565 in words is "twenty-five million, eight hundred sixty-five thousand, five hundred sixty-five".