12661748318879 has 16 divisors (see below), whose sum is σ = 14475233620224. Its totient is φ = 10962961732800.

The previous prime is 12661748318837. The next prime is 12661748318909. The reversal of 12661748318879 is 97881384716621.

It is not a de Polignac number, because 12661748318879 - 2²⁴ = 12661731541663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661748311879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107336837 + ... + 107454734.

It is an arithmetic number, because the mean of its divisors is an integer number (904702101264).

Almost surely, 2^{12661748318879} is an apocalyptic number.

12661748318879 is a deficient number, since it is larger than the sum of its proper divisors (1813485301345).

12661748318879 is a wasteful number, since it uses less digits than its factorization.

12661748318879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214791838.

The product of its digits is 195084288, while the sum is 71.

The spelling of 12661748318879 in words is "twelve trillion, six hundred sixty-one billion, seven hundred forty-eight million, three hundred eighteen thousand, eight hundred seventy-nine".