12555840663 has 24 divisors (see below), whose sum is σ = 18274542000. Its totient is φ = 8306820864.

The previous prime is 12555840653. The next prime is 12555840701. The reversal of 12555840663 is 36604855521.

12555840663 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 584 + 0 + 6 + 63 = 666.

It is not a de Polignac number, because 12555840663 - 2⁹ = 12555840151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12555840613) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1735668 + ... + 1742886.

It is an arithmetic number, because the mean of its divisors is an integer number (761439250).

Almost surely, 2^12555840663 is an apocalyptic number.

12555840663 is a deficient number, since it is larger than the sum of its proper divisors (5718701337).

12555840663 is a wasteful number, since it uses less digits than its factorization.

12555840663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8671 (or 8668 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 12555840663 in words is "twelve billion, five hundred fifty-five million, eight hundred forty thousand, six hundred sixty-three".