25580861 has 4 divisors (see below), whose sum is σ = 25599552. Its totient is φ = 25562172.

The previous prime is 25580839. The next prime is 25580881. The reversal of 25580861 is 16808552.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25580861 - 2¹⁰ = 25579837 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 (25580881) 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 3 ways as a sum of consecutive naturals, for example, 7115 + ... + 10088.

It is an arithmetic number, because the mean of its divisors is an integer number (6399888).

Almost surely, 2^25580861 is an apocalyptic number.

It is an amenable number.

25580861 is a deficient number, since it is larger than the sum of its proper divisors (18691).

25580861 is a wasteful number, since it uses less digits than its factorization.

25580861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18690.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 25580861 is about 5057.7525641336. The cubic root of 25580861 is about 294.6490550399.

The spelling of 25580861 in words is "twenty-five million, five hundred eighty thousand, eight hundred sixty-one".