12661465211 has 4 divisors (see below), whose sum is σ = 12662021712. Its totient is φ = 12660908712.

The previous prime is 12661465171. The next prime is 12661465259. The reversal of 12661465211 is 11256416621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12661465211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12661465261) 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, 242600 + ... + 290133.

It is an arithmetic number, because the mean of its divisors is an integer number (3165505428).

Almost surely, 2^12661465211 is an apocalyptic number.

12661465211 is a deficient number, since it is larger than the sum of its proper divisors (556501).

12661465211 is an equidigital number, since it uses as much as digits as its factorization.

12661465211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556500.

The product of its digits is 17280, while the sum is 35.

The spelling of 12661465211 in words is "twelve billion, six hundred sixty-one million, four hundred sixty-five thousand, two hundred eleven".