12656331665 has 8 divisors (see below), whose sum is σ = 15188361408. Its totient is φ = 10124556400.

The previous prime is 12656331631. The next prime is 12656331719. The reversal of 12656331665 is 56613365621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-12656331665 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72140 + ... + 174690.

It is an arithmetic number, because the mean of its divisors is an integer number (1898545176).

Almost surely, 2^12656331665 is an apocalyptic number.

It is an amenable number.

12656331665 is a deficient number, since it is larger than the sum of its proper divisors (2532029743).

12656331665 is a wasteful number, since it uses less digits than its factorization.

12656331665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127239.

The product of its digits is 583200, while the sum is 44.

The spelling of 12656331665 in words is "twelve billion, six hundred fifty-six million, three hundred thirty-one thousand, six hundred sixty-five".