12746664721 has 8 divisors (see below), whose sum is σ = 14574431744. Its totient is φ = 10920601440.

The previous prime is 12746664683. The next prime is 12746664731.

12746664721 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 12746664721 - 2¹³ = 12746656529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12746664731) 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, 409860 + ... + 439861.

It is an arithmetic number, because the mean of its divisors is an integer number (1821803968).

Almost surely, 2^12746664721 is an apocalyptic number.

It is an amenable number.

12746664721 is a deficient number, since it is larger than the sum of its proper divisors (1827767023).

12746664721 is an equidigital number, since it uses as much as digits as its factorization.

12746664721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851871.

The product of its digits is 677376, while the sum is 46.

The spelling of 12746664721 in words is "twelve billion, seven hundred forty-six million, six hundred sixty-four thousand, seven hundred twenty-one".