25563563 has 4 divisors (see below), whose sum is σ = 27067320. Its totient is φ = 24059808.

The previous prime is 25563553. The next prime is 25563581. The reversal of 25563563 is 36536552.

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 25563563 - 2¹² = 25559467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25563553) 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, 751853 + ... + 751886.

It is an arithmetic number, because the mean of its divisors is an integer number (6766830).

Almost surely, 2^25563563 is an apocalyptic number.

25563563 is a deficient number, since it is larger than the sum of its proper divisors (1503757).

25563563 is a wasteful number, since it uses less digits than its factorization.

25563563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503756.

The product of its digits is 81000, while the sum is 35.

The square root of 25563563 is about 5056.0422268806. The cubic root of 25563563 is about 294.5826253156.

The spelling of 25563563 in words is "twenty-five million, five hundred sixty-three thousand, five hundred sixty-three".