12687693178 has 4 divisors (see below), whose sum is σ = 19031539770. Its totient is φ = 6343846588.

The previous prime is 12687693149. The next prime is 12687693203. The reversal of 12687693178 is 87139678621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87139678621 = 233 ⋅373990037.

It can be written as a sum of positive squares in only one way, i.e., 11947145809 + 740547369 = 109303^2 + 27213^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3171923293 + ... + 3171923296.

Almost surely, 2^12687693178 is an apocalyptic number.

12687693178 is a deficient number, since it is larger than the sum of its proper divisors (6343846592).

12687693178 is an equidigital number, since it uses as much as digits as its factorization.

12687693178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6343846591.

The product of its digits is 6096384, while the sum is 58.

The spelling of 12687693178 in words is "twelve billion, six hundred eighty-seven million, six hundred ninety-three thousand, one hundred seventy-eight".