11866556 has 12 divisors (see below), whose sum is σ = 22363992. Its totient is φ = 5476848.

The previous prime is 11866553. The next prime is 11866567. The reversal of 11866556 is 65566811.

11866556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11866556² = 281630302602272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11866553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114050 + ... + 114153.

It is an arithmetic number, because the mean of its divisors is an integer number (1863666).

Almost surely, 2^11866556 is an apocalyptic number.

It is an amenable number.

11866556 is a deficient number, since it is larger than the sum of its proper divisors (10497436).

11866556 is a wasteful number, since it uses less digits than its factorization.

11866556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228220 (or 228218 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 11866556 is about 3444.7867858548. The cubic root of 11866556 is about 228.0910429471.

The spelling of 11866556 in words is "eleven million, eight hundred sixty-six thousand, five hundred fifty-six".