12116556 has 18 divisors (see below), whose sum is σ = 30628052. Its totient is φ = 4038840.

The previous prime is 12116551. The next prime is 12116557. The reversal of 12116556 is 65561121.

It is a happy number.

12116556 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 655 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×12116556² = 293621858602272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12116551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 168250 + ... + 168321.

Almost surely, 2^12116556 is an apocalyptic number.

It is an amenable number.

12116556 is an abundant number, since it is smaller than the sum of its proper divisors (18511496).

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

12116556 is a wasteful number, since it uses less digits than its factorization.

12116556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336581 (or 336576 counting only the distinct ones).

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

The square root of 12116556 is about 3480.8843703864. The cubic root of 12116556 is about 229.6817021166.

Adding to 12116556 its reverse (65561121), we get a palindrome (77677677).

The spelling of 12116556 in words is "twelve million, one hundred sixteen thousand, five hundred fifty-six".