25567 has 4 divisors (see below), whose sum is σ = 26296. Its totient is φ = 24840.

The previous prime is 25561. The next prime is 25577. The reversal of 25567 is 76552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25567 - 2⁷ = 25439 is a prime.

It is a Duffinian number.

25567 is a lucky number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561) 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 3 ways as a sum of consecutive naturals, for example, 309 + ... + 382.

It is an arithmetic number, because the mean of its divisors is an integer number (6574).

2²⁵⁵⁶⁷ is an apocalyptic number.

25567 is a deficient number, since it is larger than the sum of its proper divisors (729).

25567 is an equidigital number, since it uses as much as digits as its factorization.

25567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728.

The product of its digits is 2100, while the sum is 25.

The square root of 25567 is about 159.8968417449. The cubic root of 25567 is about 29.4595826854.

The spelling of 25567 in words is "twenty-five thousand, five hundred sixty-seven".