666485 has 8 divisors (see below), whose sum is σ = 846936. Its totient is φ = 501760.

The previous prime is 666467. The next prime is 666493. The reversal of 666485 is 584666.

It can be written as a sum of positive squares in 4 ways, for example, as 97969 + 568516 = 313^2 + 754^2 .

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

It is not a de Polignac number, because 666485 - 2⁸ = 666229 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3836 + ... + 4005.

It is an arithmetic number, because the mean of its divisors is an integer number (105867).

2⁶⁶⁶⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

666485 is a deficient number, since it is larger than the sum of its proper divisors (180451).

666485 is a wasteful number, since it uses less digits than its factorization.

666485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7863.

The product of its digits is 34560, while the sum is 35.

The square root of 666485 is about 816.3853256888. The cubic root of 666485 is about 87.3501107302.

The spelling of 666485 in words is "six hundred sixty-six thousand, four hundred eighty-five".