12665315205 has 24 divisors (see below), whose sum is σ = 22661383680. Its totient is φ = 6536936160.

The previous prime is 12665315189. The next prime is 12665315233. The reversal of 12665315205 is 50251356621.

12665315205 is a `hidden beast` number, since 12 + 66 + 531 + 52 + 0 + 5 = 666.

It is not a de Polignac number, because 12665315205 - 2⁴ = 12665315189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12665315205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4538145 + ... + 4540934.

It is an arithmetic number, because the mean of its divisors is an integer number (944224320).

Almost surely, 2^12665315205 is an apocalyptic number.

12665315205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12665315205 is a deficient number, since it is larger than the sum of its proper divisors (9996068475).

12665315205 is a wasteful number, since it uses less digits than its factorization.

12665315205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9079121 (or 9079118 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 12665315205 in words is "twelve billion, six hundred sixty-five million, three hundred fifteen thousand, two hundred five".