664603 has 2 divisors, whose sum is σ = 664604. Its totient is φ = 664602.

The previous prime is 664597. The next prime is 664613. The reversal of 664603 is 306466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664603 - 2⁵ = 664571 is a prime.

It is not a weakly prime, because it can be changed into another prime (664613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332301 + 332302.

It is an arithmetic number, because the mean of its divisors is an integer number (332302).

2⁶⁶⁴⁶⁰³ is an apocalyptic number.

664603 is a deficient number, since it is larger than the sum of its proper divisors (1).

664603 is an equidigital number, since it uses as much as digits as its factorization.

664603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 664603 is about 815.2318688570. The cubic root of 664603 is about 87.2678143607.

The spelling of 664603 in words is "six hundred sixty-four thousand, six hundred three".