664203 has 4 divisors (see below), whose sum is σ = 885608. Its totient is φ = 442800.

The previous prime is 664199. The next prime is 664211. The reversal of 664203 is 302466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 664203 - 2² = 664199 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664203.

It is not an unprimeable number, because it can be changed into a prime (664243) 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, 110698 + ... + 110703.

It is an arithmetic number, because the mean of its divisors is an integer number (221402).

2⁶⁶⁴²⁰³ is an apocalyptic number.

664203 is a deficient number, since it is larger than the sum of its proper divisors (221405).

664203 is a wasteful number, since it uses less digits than its factorization.

664203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221404.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 664203 is about 814.9865029557. The cubic root of 664203 is about 87.2503030890.

Adding to 664203 its reverse (302466), we get a palindrome (966669).

The spelling of 664203 in words is "six hundred sixty-four thousand, two hundred three".