55866 has 8 divisors (see below), whose sum is σ = 111744. Its totient is φ = 18620.

The previous prime is 55849. The next prime is 55871. The reversal of 55866 is 66855.

It is a sphenic number, since it is the product of 3 distinct primes.

55866 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4650 + ... + 4661.

It is an arithmetic number, because the mean of its divisors is an integer number (13968).

2⁵⁵⁸⁶⁶ is an apocalyptic number.

55866 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.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55872).

55866 is a wasteful number, since it uses less digits than its factorization.

55866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9316.

The product of its digits is 7200, while the sum is 30.

The square root of 55866 is about 236.3598950753. The cubic root of 55866 is about 38.2280834761.

The spelling of 55866 in words is "fifty-five thousand, eight hundred sixty-six".