25563619 has 4 divisors (see below), whose sum is σ = 25619296. Its totient is φ = 25507944.

The previous prime is 25563611. The next prime is 25563641. The reversal of 25563619 is 91636552.

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 25563619 - 2³ = 25563611 is a prime.

It is a super-2 number, since 2×25563619² = 1306997232754322, which contains 22 as substring.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 27144 + ... + 28069.

It is an arithmetic number, because the mean of its divisors is an integer number (6404824).

Almost surely, 2^25563619 is an apocalyptic number.

25563619 is a deficient number, since it is larger than the sum of its proper divisors (55677).

25563619 is an equidigital number, since it uses as much as digits as its factorization.

25563619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55676.

The product of its digits is 48600, while the sum is 37.

The square root of 25563619 is about 5056.0477648060. The cubic root of 25563619 is about 294.5828404214.

The spelling of 25563619 in words is "twenty-five million, five hundred sixty-three thousand, six hundred nineteen".