12709376128 has 16 divisors (see below), whose sum is σ = 25319460510. Its totient is φ = 6354688000.

The previous prime is 12709376123. The next prime is 12709376149. The reversal of 12709376128 is 82167390721.

It can be written as a sum of positive squares in only one way, i.e., 12296148544 + 413227584 = 110888^2 + 20328^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (12709376123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49645873 + ... + 49646128.

Almost surely, 2^12709376128 is an apocalyptic number.

It is an amenable number.

12709376128 is a deficient number, since it is larger than the sum of its proper divisors (12610084382).

12709376128 is an frugal number, since it uses more digits than its factorization.

12709376128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99292015 (or 99292003 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 12709376128 in words is "twelve billion, seven hundred nine million, three hundred seventy-six thousand, one hundred twenty-eight".