12999818865 has 16 divisors (see below), whose sum is σ = 22690593216. Its totient is φ = 6302942400.

The previous prime is 12999818863. The next prime is 12999818869. The reversal of 12999818865 is 56881899921.

It is not a de Polignac number, because 12999818865 - 2¹ = 12999818863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12999818796 and 12999818805.

It is not an unprimeable number, because it can be changed into a prime (12999818861) 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, 39393226 + ... + 39393555.

It is an arithmetic number, because the mean of its divisors is an integer number (1418162076).

Almost surely, 2^12999818865 is an apocalyptic number.

12999818865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12999818865 is a deficient number, since it is larger than the sum of its proper divisors (9690774351).

12999818865 is a wasteful number, since it uses less digits than its factorization.

12999818865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78786800.

The product of its digits is 22394880, while the sum is 66.

The spelling of 12999818865 in words is "twelve billion, nine hundred ninety-nine million, eight hundred eighteen thousand, eight hundred sixty-five".