12643126506 has 12 divisors (see below), whose sum is σ = 27393440802. Its totient is φ = 4214375496.

The previous prime is 12643126493. The next prime is 12643126511. The reversal of 12643126506 is 60562134621.

12643126506 is a `hidden beast` number, since 1 + 2 + 643 + 1 + 2 + 6 + 5 + 0 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6534297225 + 6108829281 = 80835^2 + 78159^2 .

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 5 ways as a sum of consecutive naturals, for example, 351197941 + ... + 351197976.

Almost surely, 2^12643126506 is an apocalyptic number.

12643126506 is an abundant number, since it is smaller than the sum of its proper divisors (14750314296).

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

12643126506 is a wasteful number, since it uses less digits than its factorization.

12643126506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702395925 (or 702395922 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 12643126506 in words is "twelve billion, six hundred forty-three million, one hundred twenty-six thousand, five hundred six".