664943 has 8 divisors (see below), whose sum is σ = 710400. Its totient is φ = 620568.

The previous prime is 664933. The next prime is 664949. The reversal of 664943 is 349466.

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

It is a cyclic number.

It is not a de Polignac number, because 664943 - 2⁶ = 664879 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664943.

It is not an unprimeable number, because it can be changed into a prime (664949) 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 7 ways as a sum of consecutive naturals, for example, 1280 + ... + 1722.

It is an arithmetic number, because the mean of its divisors is an integer number (88800).

2⁶⁶⁴⁹⁴³ is an apocalyptic number.

664943 is a deficient number, since it is larger than the sum of its proper divisors (45457).

664943 is a wasteful number, since it uses less digits than its factorization.

664943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541.

The product of its digits is 15552, while the sum is 32.

The square root of 664943 is about 815.4403718237. The cubic root of 664943 is about 87.2826934181.

The spelling of 664943 in words is "six hundred sixty-four thousand, nine hundred forty-three".