25516559 has 4 divisors (see below), whose sum is σ = 25529616. Its totient is φ = 25503504.

The previous prime is 25516553. The next prime is 25516571. The reversal of 25516559 is 95561552.

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 25516559 - 2²⁰ = 24467983 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 (25516553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2939 + ... + 7724.

It is an arithmetic number, because the mean of its divisors is an integer number (6382404).

Almost surely, 2^25516559 is an apocalyptic number.

25516559 is a deficient number, since it is larger than the sum of its proper divisors (13057).

25516559 is a wasteful number, since it uses less digits than its factorization.

25516559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13056.

The product of its digits is 67500, while the sum is 38.

The square root of 25516559 is about 5051.3917884084. The cubic root of 25516559 is about 294.4019637882.

The spelling of 25516559 in words is "twenty-five million, five hundred sixteen thousand, five hundred fifty-nine".