12705118236 has 54 divisors (see below), whose sum is σ = 32733366120. Its totient is φ = 4155099936.

The previous prime is 12705118229. The next prime is 12705118241. The reversal of 12705118236 is 63281150721.

It is a super-2 number, since 2×12705118236² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 12705118236.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 38305 + ... + 163943.

Almost surely, 2^12705118236 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 12705118236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16366683060).

12705118236 is an abundant number, since it is smaller than the sum of its proper divisors (20028247884).

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

12705118236 is a wasteful number, since it uses less digits than its factorization.

12705118236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125755 (or 125697 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

Adding to 12705118236 its reverse (63281150721), we get a palindrome (75986268957).

The spelling of 12705118236 in words is "twelve billion, seven hundred five million, one hundred eighteen thousand, two hundred thirty-six".