25861778216 has 16 divisors (see below), whose sum is σ = 49312713600. Its totient is φ = 12711721264.

The previous prime is 25861778191. The next prime is 25861778219. The reversal of 25861778216 is 61287716852.

It is not an unprimeable number, because it can be changed into a prime (25861778219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27395480 + ... + 27396423.

It is an arithmetic number, because the mean of its divisors is an integer number (3082044600).

Almost surely, 2^25861778216 is an apocalyptic number.

It is an amenable number.

25861778216 is a deficient number, since it is larger than the sum of its proper divisors (23450935384).

25861778216 is a wasteful number, since it uses less digits than its factorization.

25861778216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54791968 (or 54791964 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 53.

The spelling of 25861778216 in words is "twenty-five billion, eight hundred sixty-one million, seven hundred seventy-eight thousand, two hundred sixteen".