12672321324665 has 4 divisors (see below), whose sum is σ = 15206785589604. Its totient is φ = 10137857059728.

The previous prime is 12672321324661. The next prime is 12672321324727. The reversal of 12672321324665 is 56642312327621.

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 5830665014329 + 6841656310336 = 2414677^2 + 2615656^2 .

It is a cyclic number.

It is not a de Polignac number, because 12672321324665 - 2² = 12672321324661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12672321324661) 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, 1267232132462 + ... + 1267232132471.

It is an arithmetic number, because the mean of its divisors is an integer number (3801696397401).

Almost surely, 2^{12672321324665} is an apocalyptic number.

It is an amenable number.

12672321324665 is a deficient number, since it is larger than the sum of its proper divisors (2534464264939).

12672321324665 is an equidigital number, since it uses as much as digits as its factorization.

12672321324665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2534464264938.

The product of its digits is 4354560, while the sum is 50.

The spelling of 12672321324665 in words is "twelve trillion, six hundred seventy-two billion, three hundred twenty-one million, three hundred twenty-four thousand, six hundred sixty-five".