25864163 has 4 divisors (see below), whose sum is σ = 27853728. Its totient is φ = 23874600.

The previous prime is 25864151. The next prime is 25864171. The reversal of 25864163 is 36146852.

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 25864163 - 2¹⁸ = 25602019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25864133) 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, 994763 + ... + 994788.

It is an arithmetic number, because the mean of its divisors is an integer number (6963432).

Almost surely, 2^25864163 is an apocalyptic number.

25864163 is a deficient number, since it is larger than the sum of its proper divisors (1989565).

25864163 is a wasteful number, since it uses less digits than its factorization.

25864163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989564.

The product of its digits is 34560, while the sum is 35.

The square root of 25864163 is about 5085.6821568006. The cubic root of 25864163 is about 295.7327870611.

The spelling of 25864163 in words is "twenty-five million, eight hundred sixty-four thousand, one hundred sixty-three".