12555879840 has 144 divisors (see below), whose sum is σ = 48967970688. Its totient is φ = 2869913088.

The previous prime is 12555879799. The next prime is 12555879851. The reversal of 12555879840 is 4897855521.

12555879840 is a `hidden beast` number, since 1 + 2 + 5 + 558 + 7 + 9 + 84 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 612732 + ... + 632891.

It is an arithmetic number, because the mean of its divisors is an integer number (340055352).

Almost surely, 2^12555879840 is an apocalyptic number.

12555879840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12555879840 is an abundant number, since it is smaller than the sum of its proper divisors (36412090848).

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

12555879840 is a wasteful number, since it uses less digits than its factorization.

12555879840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245651 (or 1245640 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 54.

The spelling of 12555879840 in words is "twelve billion, five hundred fifty-five million, eight hundred seventy-nine thousand, eight hundred forty".