12566637642 has 16 divisors (see below), whose sum is σ = 27066604320. Its totient is φ = 3866657712.

The previous prime is 12566637631. The next prime is 12566637661. The reversal of 12566637642 is 24673666521.

12566637642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 12566637591 and 12566637600.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80555292 + ... + 80555447.

It is an arithmetic number, because the mean of its divisors is an integer number (1691662770).

Almost surely, 2^12566637642 is an apocalyptic number.

12566637642 is an abundant number, since it is smaller than the sum of its proper divisors (14499966678).

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

12566637642 is a wasteful number, since it uses less digits than its factorization.

12566637642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161110757.

The product of its digits is 2177280, while the sum is 48.

The spelling of 12566637642 in words is "twelve billion, five hundred sixty-six million, six hundred thirty-seven thousand, six hundred forty-two".