25563621 has 8 divisors (see below), whose sum is σ = 34565184. Its totient is φ = 16802240.

The previous prime is 25563611. The next prime is 25563641. The reversal of 25563621 is 12636552.

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

It is a cyclic number.

It is not a de Polignac number, because 25563621 - 2⁵ = 25563589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25563611) 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 7 ways as a sum of consecutive naturals, for example, 59796 + ... + 60221.

It is an arithmetic number, because the mean of its divisors is an integer number (4320648).

Almost surely, 2^25563621 is an apocalyptic number.

It is an amenable number.

25563621 is a deficient number, since it is larger than the sum of its proper divisors (9001563).

25563621 is a wasteful number, since it uses less digits than its factorization.

25563621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120091.

The product of its digits is 10800, while the sum is 30.

The square root of 25563621 is about 5056.0479625890. The cubic root of 25563621 is about 294.5828481038.

The spelling of 25563621 in words is "twenty-five million, five hundred sixty-three thousand, six hundred twenty-one".