12879820805 has 16 divisors (see below), whose sum is σ = 15878532864. Its totient is φ = 10022201280.

The previous prime is 12879820801. The next prime is 12879820819. The reversal of 12879820805 is 50802897821.

It is a happy number.

It is not a de Polignac number, because 12879820805 - 2² = 12879820801 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12879820801) 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 15 ways as a sum of consecutive naturals, for example, 698150 + ... + 716360.

It is an arithmetic number, because the mean of its divisors is an integer number (992408304).

Almost surely, 2^12879820805 is an apocalyptic number.

It is an amenable number.

12879820805 is a deficient number, since it is larger than the sum of its proper divisors (2998712059).

12879820805 is a wasteful number, since it uses less digits than its factorization.

12879820805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22076.

The product of its (nonzero) digits is 645120, while the sum is 50.

The spelling of 12879820805 in words is "twelve billion, eight hundred seventy-nine million, eight hundred twenty thousand, eight hundred five".