12516516 has 72 divisors (see below), whose sum is σ = 34507200. Its totient is φ = 3810240.

The previous prime is 12516481. The next prime is 12516563. The reversal of 12516516 is 61561521.

It is a happy number.

12516516 is a `hidden beast` number, since 1 + 2 + 5 + 1 + 651 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 12516516.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19521 + ... + 20151.

Almost surely, 2^12516516 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 12516516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17253600).

12516516 is an abundant number, since it is smaller than the sum of its proper divisors (21990684).

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

12516516 is a wasteful number, since it uses less digits than its factorization.

12516516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 684 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 12516516 is about 3537.8688500282. The cubic root of 12516516 is about 232.1816106708.

It can be divided in two parts, 125 and 16516, that added together give a square (16641 = 129²).

The spelling of 12516516 in words is "twelve million, five hundred sixteen thousand, five hundred sixteen".