12908185616 has 20 divisors (see below), whose sum is σ = 25481490732. Its totient is φ = 6332317056.

The previous prime is 12908185547. The next prime is 12908185627. The reversal of 12908185616 is 61658180921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9121014016 + 3787171600 = 95504^2 + 61540^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7610111 + ... + 7611806.

Almost surely, 2^12908185616 is an apocalyptic number.

12908185616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12908185616 is a deficient number, since it is larger than the sum of its proper divisors (12573305116).

12908185616 is a wasteful number, since it uses less digits than its factorization.

12908185616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15221978 (or 15221972 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 12908185616 in words is "twelve billion, nine hundred eight million, one hundred eighty-five thousand, six hundred sixteen".