66558 has 8 divisors (see below), whose sum is σ = 133128. Its totient is φ = 22184.

The previous prime is 66553. The next prime is 66569. The reversal of 66558 is 85566.

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

66558 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66553) 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, 5541 + ... + 5552.

It is an arithmetic number, because the mean of its divisors is an integer number (16641).

2⁶⁶⁵⁵⁸ is an apocalyptic number.

66558 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 (66564).

66558 is a wasteful number, since it uses less digits than its factorization.

66558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11098.

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

The square root of 66558 is about 257.9883718310. The cubic root of 66558 is about 40.5259702355.

The spelling of 66558 in words is "sixty-six thousand, five hundred fifty-eight".