12779316205 has 4 divisors (see below), whose sum is σ = 15335179452. Its totient is φ = 10223452960.

The previous prime is 12779316181. The next prime is 12779316241. The reversal of 12779316205 is 50261397721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4216034761 + 8563281444 = 64931^2 + 92538^2 .

It is not a de Polignac number, because 12779316205 - 2¹¹ = 12779314157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277931616 + ... + 1277931625.

It is an arithmetic number, because the mean of its divisors is an integer number (3833794863).

Almost surely, 2^12779316205 is an apocalyptic number.

It is an amenable number.

12779316205 is a deficient number, since it is larger than the sum of its proper divisors (2555863247).

12779316205 is an equidigital number, since it uses as much as digits as its factorization.

12779316205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555863246.

The product of its (nonzero) digits is 158760, while the sum is 43.

The spelling of 12779316205 in words is "twelve billion, seven hundred seventy-nine million, three hundred sixteen thousand, two hundred five".