665586 has 24 divisors (see below), whose sum is σ = 1460160. Its totient is φ = 219096.

The previous prime is 665573. The next prime is 665591. The reversal of 665586 is 685566.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 665586.

It is an unprimeable 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 11 ways as a sum of consecutive naturals, for example, 1675 + ... + 2033.

It is an arithmetic number, because the mean of its divisors is an integer number (60840).

2⁶⁶⁵⁵⁸⁶ is an apocalyptic number.

665586 is an abundant number, since it is smaller than the sum of its proper divisors (794574).

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

665586 is a wasteful number, since it uses less digits than its factorization.

665586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 467 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 665586 is about 815.8345420488. The cubic root of 665586 is about 87.3108184811.

It can be divided in two parts, 66558 and 6, that added together give a square (66564 = 258²).

The spelling of 665586 in words is "six hundred sixty-five thousand, five hundred eighty-six".