12466216562521 has 4 divisors (see below), whose sum is σ = 12466687741200. Its totient is φ = 12465745383844.

The previous prime is 12466216562509. The next prime is 12466216562561. The reversal of 12466216562521 is 12526561266421.

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 a de Polignac number, because none of the positive numbers 2^k-12466216562521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12466216562561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235549651 + ... + 235602568.

It is an arithmetic number, because the mean of its divisors is an integer number (3116671935300).

Almost surely, 2^{12466216562521} is an apocalyptic number.

It is an amenable number.

12466216562521 is a deficient number, since it is larger than the sum of its proper divisors (471178679).

12466216562521 is an equidigital number, since it uses as much as digits as its factorization.

12466216562521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471178678.

The product of its digits is 2073600, while the sum is 49.

The spelling of 12466216562521 in words is "twelve trillion, four hundred sixty-six billion, two hundred sixteen million, five hundred sixty-two thousand, five hundred twenty-one".