25665271 has 4 divisors (see below), whose sum is σ = 25746552. Its totient is φ = 25583992.

The previous prime is 25665259. The next prime is 25665317. The reversal of 25665271 is 17256652.

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 25665271 - 2⁵ = 25665239 is a prime.

It is a super-2 number, since 2×25665271² = 1317412271006882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25665251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40165 + ... + 40798.

It is an arithmetic number, because the mean of its divisors is an integer number (6436638).

Almost surely, 2^25665271 is an apocalyptic number.

25665271 is a deficient number, since it is larger than the sum of its proper divisors (81281).

25665271 is an equidigital number, since it uses as much as digits as its factorization.

25665271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81280.

The product of its digits is 25200, while the sum is 34.

The square root of 25665271 is about 5066.0903071303. The cubic root of 25665271 is about 294.9727869181.

The spelling of 25665271 in words is "twenty-five million, six hundred sixty-five thousand, two hundred seventy-one".