25681865 has 16 divisors (see below), whose sum is σ = 33794496. Its totient is φ = 18580800.

The previous prime is 25681861. The next prime is 25681871. The reversal of 25681865 is 56818652.

It is not a de Polignac number, because 25681865 - 2² = 25681861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25681861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10499 + ... + 12711.

It is an arithmetic number, because the mean of its divisors is an integer number (2112156).

Almost surely, 2^25681865 is an apocalyptic number.

It is an amenable number.

25681865 is a deficient number, since it is larger than the sum of its proper divisors (8112631).

25681865 is a wasteful number, since it uses less digits than its factorization.

25681865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440.

The product of its digits is 115200, while the sum is 41.

The square root of 25681865 is about 5067.7277945841. The cubic root of 25681865 is about 295.0363452299.

The spelling of 25681865 in words is "twenty-five million, six hundred eighty-one thousand, eight hundred sixty-five".