666582 has 32 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 186528.

The previous prime is 666559. The next prime is 666599. The reversal of 666582 is 285666.

It is a congruent number.

It is an unprimeable number.

666582 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2344 + ... + 2612.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2⁶⁶⁶⁵⁸² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666582, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777600).

666582 is an abundant number, since it is smaller than the sum of its proper divisors (888618).

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

666582 is a wasteful number, since it uses less digits than its factorization.

666582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340.

The product of its digits is 17280, while the sum is 33.

The square root of 666582 is about 816.4447317486. Note that the first 3 decimals coincide. The cubic root of 666582 is about 87.3543481598.

The spelling of 666582 in words is "six hundred sixty-six thousand, five hundred eighty-two".