25865636516 has 12 divisors (see below), whose sum is σ = 47232901632. Its totient is φ = 12370521768.

The previous prime is 25865636513. The next prime is 25865636543. The reversal of 25865636516 is 61563656852.

It is not an unprimeable number, because it can be changed into a prime (25865636513) 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, 140574020 + ... + 140574203.

It is an arithmetic number, because the mean of its divisors is an integer number (3936075136).

Almost surely, 2^25865636516 is an apocalyptic number.

It is an amenable number.

25865636516 is a deficient number, since it is larger than the sum of its proper divisors (21367265116).

25865636516 is a wasteful number, since it uses less digits than its factorization.

25865636516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281148250 (or 281148248 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 53.

The spelling of 25865636516 in words is "twenty-five billion, eight hundred sixty-five million, six hundred thirty-six thousand, five hundred sixteen".