25666163 has 4 divisors (see below), whose sum is σ = 25684848. Its totient is φ = 25647480.

The previous prime is 25666153. The next prime is 25666181. The reversal of 25666163 is 36166652.

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 25666163 - 2⁶ = 25666099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25666133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7103 + ... + 10088.

It is an arithmetic number, because the mean of its divisors is an integer number (6421212).

Almost surely, 2^25666163 is an apocalyptic number.

25666163 is a deficient number, since it is larger than the sum of its proper divisors (18685).

25666163 is a wasteful number, since it uses less digits than its factorization.

25666163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18684.

The product of its digits is 38880, while the sum is 35.

The square root of 25666163 is about 5066.1783426958. The cubic root of 25666163 is about 294.9762041516.

The spelling of 25666163 in words is "twenty-five million, six hundred sixty-six thousand, one hundred sixty-three".