25663871 has 2 divisors, whose sum is σ = 25663872. Its totient is φ = 25663870.

The previous prime is 25663867. The next prime is 25663901. The reversal of 25663871 is 17836652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25663871 - 2² = 25663867 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25663831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12831935 + 12831936.

It is an arithmetic number, because the mean of its divisors is an integer number (12831936).

Almost surely, 2^25663871 is an apocalyptic number.

25663871 is a deficient number, since it is larger than the sum of its proper divisors (1).

25663871 is an equidigital number, since it uses as much as digits as its factorization.

25663871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 25663871 is about 5065.9521316333. The cubic root of 25663871 is about 294.9674233873.

The spelling of 25663871 in words is "twenty-five million, six hundred sixty-three thousand, eight hundred seventy-one".