12865440188 has 24 divisors (see below), whose sum is σ = 22882951392. Its totient is φ = 6328249344.

The previous prime is 12865440173. The next prime is 12865440209. The reversal of 12865440188 is 88104456821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34481 + ... + 164072.

It is an arithmetic number, because the mean of its divisors is an integer number (953456308).

Almost surely, 2^12865440188 is an apocalyptic number.

It is an amenable number.

12865440188 is a deficient number, since it is larger than the sum of its proper divisors (10017511204).

12865440188 is a wasteful number, since it uses less digits than its factorization.

12865440188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198821 (or 198819 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 47.

The spelling of 12865440188 in words is "twelve billion, eight hundred sixty-five million, four hundred forty thousand, one hundred eighty-eight".