2166556 has 12 divisors (see below), whose sum is σ = 4333168. Its totient is φ = 928512.

The previous prime is 2166553. The next prime is 2166557. The reversal of 2166556 is 6556612.

2166556 is an admirable number.

It is a super-2 number, since 2×2166556² = 9387929802272, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166553) 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, 38661 + ... + 38716.

2^2166556 is an apocalyptic number.

It is an amenable number.

2166556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2166556 is a wasteful number, since it uses less digits than its factorization.

2166556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77388 (or 77386 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 2166556 is about 1471.9225523104. The cubic root of 2166556 is about 129.3967314736.

The spelling of 2166556 in words is "two million, one hundred sixty-six thousand, five hundred fifty-six".