12643556103 has 12 divisors (see below), whose sum is σ = 18344813760. Its totient is φ = 8391237696.

The previous prime is 12643556087. The next prime is 12643556171. The reversal of 12643556103 is 30165534621.

12643556103 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 35 + 5 + 610 + 3 = 666.

It is not a de Polignac number, because 12643556103 - 2⁴ = 12643556087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643556203) 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 11 ways as a sum of consecutive naturals, for example, 3147858 + ... + 3151871.

It is an arithmetic number, because the mean of its divisors is an integer number (1528734480).

Almost surely, 2^12643556103 is an apocalyptic number.

12643556103 is a deficient number, since it is larger than the sum of its proper divisors (5701257657).

12643556103 is a wasteful number, since it uses less digits than its factorization.

12643556103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6299958 (or 6299955 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 12643556103 in words is "twelve billion, six hundred forty-three million, five hundred fifty-six thousand, one hundred three".