25865613 has 12 divisors (see below), whose sum is σ = 37464960. Its totient is φ = 17195976.

The previous prime is 25865611. The next prime is 25865617. The reversal of 25865613 is 31656852.

It is not a de Polignac number, because 25865613 - 2¹ = 25865611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25865611) 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 11 ways as a sum of consecutive naturals, for example, 381 + ... + 7202.

It is an arithmetic number, because the mean of its divisors is an integer number (3122080).

Almost surely, 2^25865613 is an apocalyptic number.

It is an amenable number.

25865613 is a deficient number, since it is larger than the sum of its proper divisors (11599347).

25865613 is a wasteful number, since it uses less digits than its factorization.

25865613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7968 (or 7965 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 25865613 is about 5085.8247118830. The cubic root of 25865613 is about 295.7383134275.

The spelling of 25865613 in words is "twenty-five million, eight hundred sixty-five thousand, six hundred thirteen".