25663 has 4 divisors (see below), whose sum is σ = 28008. Its totient is φ = 23320.

The previous prime is 25657. The next prime is 25667. The reversal of 25663 is 36652.

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

It is not a de Polignac number, because 25663 - 2¹³ = 17471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1156 + ... + 1177.

It is an arithmetic number, because the mean of its divisors is an integer number (7002).

2²⁵⁶⁶³ is an apocalyptic number.

25663 is a deficient number, since it is larger than the sum of its proper divisors (2345).

25663 is a wasteful number, since it uses less digits than its factorization.

25663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344.

The product of its digits is 1080, while the sum is 22.

The square root of 25663 is about 160.1967540245. The cubic root of 25663 is about 29.4964086407.

It can be divided in two parts, 2 and 5663, that added together give a palindrome (5665).

The spelling of 25663 in words is "twenty-five thousand, six hundred sixty-three".