25562565 has 36 divisors (see below), whose sum is σ = 51546924. Its totient is φ = 11684736.

The previous prime is 25562561. The next prime is 25562567. The reversal of 25562565 is 56526552.

25562565 is a `hidden beast` number, since 25 + 5 + 625 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17994564 + 7568001 = 4242^2 + 2751^2 .

It is not a de Polignac number, because 25562565 - 2² = 25562561 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 (25562561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3592 + ... + 8001.

It is an arithmetic number, because the mean of its divisors is an integer number (1431859).

Almost surely, 2^25562565 is an apocalyptic number.

It is an amenable number.

25562565 is an abundant number, since it is smaller than the sum of its proper divisors (25984359).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25562565 is a wasteful number, since it uses less digits than its factorization.

25562565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11618 (or 11608 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The square root of 25562565 is about 5055.9435321214. The cubic root of 25562565 is about 294.5787917696.

The spelling of 25562565 in words is "twenty-five million, five hundred sixty-two thousand, five hundred sixty-five".