12856336640 has 144 divisors (see below), whose sum is σ = 35253603840. Its totient is φ = 4400455680.

The previous prime is 12856336621. The next prime is 12856336651. The reversal of 12856336640 is 4663365821.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12856336591 and 12856336600.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9308750 + ... + 9310130.

Almost surely, 2^12856336640 is an apocalyptic number.

12856336640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12856336640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17626801920).

12856336640 is an abundant number, since it is smaller than the sum of its proper divisors (22397267200).

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

12856336640 is a wasteful number, since it uses less digits than its factorization.

12856336640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448 (or 2434 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 12856336640 in words is "twelve billion, eight hundred fifty-six million, three hundred thirty-six thousand, six hundred forty".