12661812008 has 16 divisors (see below), whose sum is σ = 23743659060. Its totient is φ = 6330169600.

The previous prime is 12661811971. The next prime is 12661812013. The reversal of 12661812008 is 80021816621.

It can be written as a sum of positive squares in 2 ways, for example, as 12661200484 + 611524 = 112522^2 + 782^2 .

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 3 ways as a sum of consecutive naturals, for example, 15203 + ... + 159858.

Almost surely, 2^12661812008 is an apocalyptic number.

It is an amenable number.

12661812008 is a deficient number, since it is larger than the sum of its proper divisors (11081847052).

12661812008 is a wasteful number, since it uses less digits than its factorization.

12661812008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184108 (or 184104 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The spelling of 12661812008 in words is "twelve billion, six hundred sixty-one million, eight hundred twelve thousand, eight".