25680261 has 4 divisors (see below), whose sum is σ = 34240352. Its totient is φ = 17120172.

The previous prime is 25680253. The next prime is 25680271. The reversal of 25680261 is 16208652.

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 not a de Polignac number, because 25680261 - 2³ = 25680253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25680271) 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, 4280041 + ... + 4280046.

It is an arithmetic number, because the mean of its divisors is an integer number (8560088).

Almost surely, 2^25680261 is an apocalyptic number.

It is an amenable number.

25680261 is a deficient number, since it is larger than the sum of its proper divisors (8560091).

25680261 is an equidigital number, since it uses as much as digits as its factorization.

25680261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8560090.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 25680261 is about 5067.5695357834. The cubic root of 25680261 is about 295.0302027872.

The spelling of 25680261 in words is "twenty-five million, six hundred eighty thousand, two hundred sixty-one".