12666516073 has 4 divisors (see below), whose sum is σ = 12670456660. Its totient is φ = 12662575488.

The previous prime is 12666516059. The next prime is 12666516091. The reversal of 12666516073 is 37061566621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5344633449 + 7321882624 = 73107^2 + 85568^2 .

It is a cyclic number.

It is not a de Polignac number, because 12666516073 - 2¹³ = 12666507881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12666516053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1965468 + ... + 1971901.

It is an arithmetic number, because the mean of its divisors is an integer number (3167614165).

Almost surely, 2^12666516073 is an apocalyptic number.

It is an amenable number.

12666516073 is a deficient number, since it is larger than the sum of its proper divisors (3940587).

12666516073 is an equidigital number, since it uses as much as digits as its factorization.

12666516073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940586.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 12666516073 in words is "twelve billion, six hundred sixty-six million, five hundred sixteen thousand, seventy-three".