25165565 has 16 divisors (see below), whose sum is σ = 32054400. Its totient is φ = 18925632.

The previous prime is 25165561. The next prime is 25165597. The reversal of 25165565 is 56556152.

It is a cyclic number.

It is not a de Polignac number, because 25165565 - 2² = 25165561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25165561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4931 + ... + 8639.

It is an arithmetic number, because the mean of its divisors is an integer number (2003400).

Almost surely, 2^25165565 is an apocalyptic number.

It is an amenable number.

25165565 is a deficient number, since it is larger than the sum of its proper divisors (6888835).

25165565 is a wasteful number, since it uses less digits than its factorization.

25165565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3796.

The product of its digits is 45000, while the sum is 35.

The square root of 25165565 is about 5016.5291786254. The cubic root of 25165565 is about 293.0458407700.

The spelling of 25165565 in words is "twenty-five million, one hundred sixty-five thousand, five hundred sixty-five".