25138663 has 4 divisors (see below), whose sum is σ = 27424008. Its totient is φ = 22853320.

The previous prime is 25138643. The next prime is 25138667. The reversal of 25138663 is 36683152.

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 25138663 - 2⁹ = 25138151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25138667) 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, 1142656 + ... + 1142677.

It is an arithmetic number, because the mean of its divisors is an integer number (6856002).

Almost surely, 2^25138663 is an apocalyptic number.

25138663 is a deficient number, since it is larger than the sum of its proper divisors (2285345).

25138663 is a wasteful number, since it uses less digits than its factorization.

25138663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285344.

The product of its digits is 25920, while the sum is 34.

The square root of 25138663 is about 5013.8471257110. The cubic root of 25138663 is about 292.9413814948.

The spelling of 25138663 in words is "twenty-five million, one hundred thirty-eight thousand, six hundred sixty-three".