12135885218 has 18 divisors (see below), whose sum is σ = 18521647443. Its totient is φ = 5963794320.

The previous prime is 12135885199. The next prime is 12135885233. The reversal of 12135885218 is 81258853121.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 1356669889 + 10779215329 = 36833^2 + 103823^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=77897.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9502796 + ... + 9504072.

Almost surely, 2^12135885218 is an apocalyptic number.

12135885218 is a deficient number, since it is larger than the sum of its proper divisors (6385762225).

12135885218 is an frugal number, since it uses more digits than its factorization.

12135885218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2678 (or 1340 counting only the distinct ones).

The product of its digits is 153600, while the sum is 44.

The spelling of 12135885218 in words is "twelve billion, one hundred thirty-five million, eight hundred eighty-five thousand, two hundred eighteen".