12666706441 has 4 divisors (see below), whose sum is σ = 13217432832. Its totient is φ = 12115980052.

The previous prime is 12666706439. The next prime is 12666706447. The reversal of 12666706441 is 14460766621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12666706441 - 2¹ = 12666706439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12666706447) 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 3 ways as a sum of consecutive naturals, for example, 275363161 + ... + 275363206.

It is an arithmetic number, because the mean of its divisors is an integer number (3304358208).

Almost surely, 2^12666706441 is an apocalyptic number.

It is an amenable number.

12666706441 is a deficient number, since it is larger than the sum of its proper divisors (550726391).

12666706441 is an equidigital number, since it uses as much as digits as its factorization.

12666706441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550726390.

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 12666706441 in words is "twelve billion, six hundred sixty-six million, seven hundred six thousand, four hundred forty-one".