25640163 has 24 divisors (see below), whose sum is σ = 38050896. Its totient is φ = 16632000.

The previous prime is 25640081. The next prime is 25640171. The reversal of 25640163 is 36104652.

25640163 is a `hidden beast` number, since 2 + 5 + 640 + 16 + 3 = 666.

It is not a de Polignac number, because 25640163 - 2⁸ = 25639907 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (25640183) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60693 + ... + 61113.

It is an arithmetic number, because the mean of its divisors is an integer number (1585454).

Almost surely, 2^25640163 is an apocalyptic number.

25640163 is a deficient number, since it is larger than the sum of its proper divisors (12410733).

25640163 is a wasteful number, since it uses less digits than its factorization.

25640163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 25640163 is about 5063.6116557256. The cubic root of 25640163 is about 294.8765661902.

The spelling of 25640163 in words is "twenty-five million, six hundred forty thousand, one hundred sixty-three".