11816556 has 24 divisors (see below), whose sum is σ = 29023680. Its totient is φ = 3731472.

The previous prime is 11816551. The next prime is 11816557. The reversal of 11816556 is 65561811.

11816556 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11816556² = 279261991402272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11816551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25686 + ... + 26141.

It is an arithmetic number, because the mean of its divisors is an integer number (1209320).

Almost surely, 2^11816556 is an apocalyptic number.

It is an amenable number.

11816556 is an abundant number, since it is smaller than the sum of its proper divisors (17207124).

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

11816556 is a wasteful number, since it uses less digits than its factorization.

11816556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51853 (or 51851 counting only the distinct ones).

The product of its digits is 7200, while the sum is 33.

The square root of 11816556 is about 3437.5217817492. The cubic root of 11816556 is about 227.7702363731.

The spelling of 11816556 in words is "eleven million, eight hundred sixteen thousand, five hundred fifty-six".