25305563 has 4 divisors (see below), whose sum is σ = 25326288. Its totient is φ = 25284840.

The previous prime is 25305557. The next prime is 25305593. The reversal of 25305563 is 36550352.

It is a happy number.

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 25305563 - 2⁸ = 25305307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25305593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8408 + ... + 11013.

It is an arithmetic number, because the mean of its divisors is an integer number (6331572).

Almost surely, 2^25305563 is an apocalyptic number.

25305563 is a deficient number, since it is larger than the sum of its proper divisors (20725).

25305563 is a wasteful number, since it uses less digits than its factorization.

25305563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20724.

The product of its (nonzero) digits is 13500, while the sum is 29.

The square root of 25305563 is about 5030.4634975318. The cubic root of 25305563 is about 293.5882484772.

The spelling of 25305563 in words is "twenty-five million, three hundred five thousand, five hundred sixty-three".