25563999 has 8 divisors (see below), whose sum is σ = 34111792. Its totient is φ = 17029440.

The previous prime is 25563997. The next prime is 25564001. The reversal of 25563999 is 99936552.

It is an interprime number because it is at equal distance from previous prime (25563997) and next prime (25564001).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25563999 - 2¹ = 25563997 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 (25563991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2829 + ... + 7689.

It is an arithmetic number, because the mean of its divisors is an integer number (4263974).

Almost surely, 2^25563999 is an apocalyptic number.

25563999 is a deficient number, since it is larger than the sum of its proper divisors (8547793).

25563999 is a wasteful number, since it uses less digits than its factorization.

25563999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6617.

The product of its digits is 656100, while the sum is 48.

The square root of 25563999 is about 5056.0853434253. The cubic root of 25563999 is about 294.5843000599.

It can be divided in two parts, 25563 and 999, that added together give a palindrome (26562).

The spelling of 25563999 in words is "twenty-five million, five hundred sixty-three thousand, nine hundred ninety-nine".