25669 has 8 divisors (see below), whose sum is σ = 31040. Its totient is φ = 20736.

The previous prime is 25667. The next prime is 25673. The reversal of 25669 is 96652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 4-Lehmer number, since φ(25669) divides (25669-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 25669 - 2¹ = 25667 is a prime.

It is a super-2 number, since 2×25669² = 1317795122, which contains 22 as substring.

It is a Duffinian 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 (25667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37 + ... + 229.

It is an arithmetic number, because the mean of its divisors is an integer number (3880).

2²⁵⁶⁶⁹ is an apocalyptic number.

25669 is the 93-rd hex number.

It is an amenable number.

25669 is a deficient number, since it is larger than the sum of its proper divisors (5371).

25669 is a wasteful number, since it uses less digits than its factorization.

25669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219.

The product of its digits is 3240, while the sum is 28.

The square root of 25669 is about 160.2154799013. The cubic root of 25669 is about 29.4987072114.

It can be divided in two parts, 256 and 69, that added together give a triangular number (325 = T₂₅).

The spelling of 25669 in words is "twenty-five thousand, six hundred sixty-nine".