12661456366 has 16 divisors (see below), whose sum is σ = 20663982864. Its totient is φ = 5783503104.

The previous prime is 12661456331. The next prime is 12661456373. The reversal of 12661456366 is 66365416621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2507680 + ... + 2512723.

It is an arithmetic number, because the mean of its divisors is an integer number (1291498929).

Almost surely, 2^12661456366 is an apocalyptic number.

12661456366 is a deficient number, since it is larger than the sum of its proper divisors (8002526498).

12661456366 is a wasteful number, since it uses less digits than its factorization.

12661456366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5020515.

The product of its digits is 933120, while the sum is 46.

The spelling of 12661456366 in words is "twelve billion, six hundred sixty-one million, four hundred fifty-six thousand, three hundred sixty-six".