12786659771 has 4 divisors (see below), whose sum is σ = 12879993192. Its totient is φ = 12693326352.

The previous prime is 12786659759. The next prime is 12786659789. The reversal of 12786659771 is 17795668721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12786659771 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12786659771.

It is not an unprimeable number, because it can be changed into a prime (12786659741) 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, 46666505 + ... + 46666778.

It is an arithmetic number, because the mean of its divisors is an integer number (3219998298).

Almost surely, 2^12786659771 is an apocalyptic number.

12786659771 is a deficient number, since it is larger than the sum of its proper divisors (93333421).

12786659771 is an equidigital number, since it uses as much as digits as its factorization.

12786659771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93333420.

The product of its digits is 8890560, while the sum is 59.

The spelling of 12786659771 in words is "twelve billion, seven hundred eighty-six million, six hundred fifty-nine thousand, seven hundred seventy-one".