12728666693 has 8 divisors (see below), whose sum is σ = 13283827200. Its totient is φ = 12173651248.

The previous prime is 12728666669. The next prime is 12728666723. The reversal of 12728666693 is 39666682721.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12728666693 - 2¹⁶ = 12728601157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12728666623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167468 + ... + 231306.

It is an arithmetic number, because the mean of its divisors is an integer number (1660478400).

Almost surely, 2^12728666693 is an apocalyptic number.

It is an amenable number.

12728666693 is a deficient number, since it is larger than the sum of its proper divisors (555160507).

12728666693 is an equidigital number, since it uses as much as digits as its factorization.

12728666693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72531.

The product of its digits is 7838208, while the sum is 56.

The spelling of 12728666693 in words is "twelve billion, seven hundred twenty-eight million, six hundred sixty-six thousand, six hundred ninety-three".