12856840660 has 24 divisors (see below), whose sum is σ = 27729079560. Its totient is φ = 5003743104.

The previous prime is 12856840643. The next prime is 12856840681. The reversal of 12856840660 is 6604865821.

It can be written as a sum of positive squares in 4 ways, for example, as 1217451664 + 11639388996 = 34892^2 + 107886^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12856840660.

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, 8686315 + ... + 8687794.

It is an arithmetic number, because the mean of its divisors is an integer number (1155378315).

Almost surely, 2^12856840660 is an apocalyptic number.

12856840660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12856840660 is an abundant number, since it is smaller than the sum of its proper divisors (14872238900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12856840660 is a wasteful number, since it uses less digits than its factorization.

12856840660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17374155 (or 17374153 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 12856840660 in words is "twelve billion, eight hundred fifty-six million, eight hundred forty thousand, six hundred sixty".