12665805516 has 384 divisors, whose sum is σ = 42261739520. Its totient is φ = 3191270400.

The previous prime is 12665805499. The next prime is 12665805541. The reversal of 12665805516 is 61550856621.

12665805516 is a `hidden beast` number, since 1 + 2 + 6 + 6 + 580 + 55 + 16 = 666.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 22181511 + ... + 22182081.

Almost surely, 2^12665805516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12665805516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21130869760).

12665805516 is an abundant number, since it is smaller than the sum of its proper divisors (29595934004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12665805516 is a wasteful number, since it uses less digits than its factorization.

12665805516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 12665805516 in words is "twelve billion, six hundred sixty-five million, eight hundred five thousand, five hundred sixteen".