12856497840 has 60 divisors (see below), whose sum is σ = 43176407664. Its totient is φ = 3428399232.

The previous prime is 12856497811. The next prime is 12856497851. The reversal of 12856497840 is 4879465821.

It is a happy number.

12856497840 is a `hidden beast` number, since 1 + 2 + 8 + 564 + 9 + 78 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8927404 + ... + 8928843.

Almost surely, 2^12856497840 is an apocalyptic number.

12856497840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12856497840 is an abundant number, since it is smaller than the sum of its proper divisors (30319909824).

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

12856497840 is a wasteful number, since it uses less digits than its factorization.

12856497840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17856266 (or 17856257 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 12856497840 in words is "twelve billion, eight hundred fifty-six million, four hundred ninety-seven thousand, eight hundred forty".