664966 has 8 divisors (see below), whose sum is σ = 1000944. Its totient is φ = 331320.

The previous prime is 664949. The next prime is 664967. The reversal of 664966 is 669466.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676 + ... + 1336.

It is an arithmetic number, because the mean of its divisors is an integer number (125118).

2⁶⁶⁴⁹⁶⁶ is an apocalyptic number.

664966 is a deficient number, since it is larger than the sum of its proper divisors (335978).

664966 is a wasteful number, since it uses less digits than its factorization.

664966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166.

The product of its digits is 46656, while the sum is 37.

The square root of 664966 is about 815.4544745110. The cubic root of 664966 is about 87.2836997594.

It can be divided in two parts, 6649 and 66, that multiplied together give a palindrome (438834).

The spelling of 664966 in words is "six hundred sixty-four thousand, nine hundred sixty-six".