12664678726 has 8 divisors (see below), whose sum is σ = 21710877840. Its totient is φ = 5427719448.

The previous prime is 12664678709. The next prime is 12664678727. The reversal of 12664678726 is 62787646621.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12664678727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452309941 + ... + 452309968.

It is an arithmetic number, because the mean of its divisors is an integer number (2713859730).

Almost surely, 2^12664678726 is an apocalyptic number.

12664678726 is a deficient number, since it is larger than the sum of its proper divisors (9046199114).

12664678726 is an equidigital number, since it uses as much as digits as its factorization.

12664678726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904619918.

The product of its digits is 8128512, while the sum is 55.

The spelling of 12664678726 in words is "twelve billion, six hundred sixty-four million, six hundred seventy-eight thousand, seven hundred twenty-six".