12655715779 has 4 divisors (see below), whose sum is σ = 14463675184. Its totient is φ = 10847756376.

The previous prime is 12655715777. The next prime is 12655715783. The reversal of 12655715779 is 97751755621.

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

It is a cyclic number.

It is not a de Polignac number, because 12655715779 - 2¹ = 12655715777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12655715771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 903979692 + ... + 903979705.

It is an arithmetic number, because the mean of its divisors is an integer number (3615918796).

Almost surely, 2^12655715779 is an apocalyptic number.

12655715779 is a deficient number, since it is larger than the sum of its proper divisors (1807959405).

12655715779 is an equidigital number, since it uses as much as digits as its factorization.

12655715779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807959404.

The product of its digits is 4630500, while the sum is 55.

The spelling of 12655715779 in words is "twelve billion, six hundred fifty-five million, seven hundred fifteen thousand, seven hundred seventy-nine".