666588 has 24 divisors (see below), whose sum is σ = 1675408. Its totient is φ = 205056.

The previous prime is 666559. The next prime is 666599. The reversal of 666588 is 885666.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

666588 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 7 ways as a sum of consecutive naturals, for example, 1981 + ... + 2292.

2⁶⁶⁶⁵⁸⁸ is an apocalyptic number.

It is an amenable number.

666588 is an abundant number, since it is smaller than the sum of its proper divisors (1008820).

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

666588 is a wasteful number, since it uses less digits than its factorization.

666588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4293 (or 4291 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 666588 is about 816.4484062083. The cubic root of 666588 is about 87.3546102553.

It can be divided in two parts, 66658 and 8, that added together give a palindrome (66666).

The spelling of 666588 in words is "six hundred sixty-six thousand, five hundred eighty-eight".