25543565 has 4 divisors (see below), whose sum is σ = 30652284. Its totient is φ = 20434848.

The previous prime is 25543541. The next prime is 25543621. The reversal of 25543565 is 56534552.

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 7540516 + 18003049 = 2746^2 + 4243^2 .

It is a cyclic number.

It is not a de Polignac number, because 25543565 - 2¹⁴ = 25527181 is a prime.

It is a Duffinian 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, 2554352 + ... + 2554361.

It is an arithmetic number, because the mean of its divisors is an integer number (7663071).

Almost surely, 2^25543565 is an apocalyptic number.

It is an amenable number.

25543565 is a deficient number, since it is larger than the sum of its proper divisors (5108719).

25543565 is an equidigital number, since it uses as much as digits as its factorization.

25543565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5108718.

The product of its digits is 90000, while the sum is 35.

The square root of 25543565 is about 5054.0642061612. The cubic root of 25543565 is about 294.5057893887.

The spelling of 25543565 in words is "twenty-five million, five hundred forty-three thousand, five hundred sixty-five".