659966 has 8 divisors (see below), whose sum is σ = 1002720. Its totient is φ = 325728.

The previous prime is 659963. The next prime is 659983. The reversal of 659966 is 669956.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659963) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1931 + ... + 2246.

It is an arithmetic number, because the mean of its divisors is an integer number (125340).

2⁶⁵⁹⁹⁶⁶ is an apocalyptic number.

659966 is a deficient number, since it is larger than the sum of its proper divisors (342754).

659966 is a wasteful number, since it uses less digits than its factorization.

659966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4258.

The product of its digits is 87480, while the sum is 41.

The square root of 659966 is about 812.3829146406. The cubic root of 659966 is about 87.0643818154.

It can be divided in two parts, 6599 and 66, that multiplied together give a palindrome (435534).

The spelling of 659966 in words is "six hundred fifty-nine thousand, nine hundred sixty-six".