664544603 has 16 divisors (see below), whose sum is σ = 717050880. Its totient is φ = 613631616.

The previous prime is 664544597. The next prime is 664544651. The reversal of 664544603 is 306445466.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 664544603 - 2⁶ = 664544539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664544663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222800 + ... + 225762.

It is an arithmetic number, because the mean of its divisors is an integer number (44815680).

Almost surely, 2^664544603 is an apocalyptic number.

664544603 is a deficient number, since it is larger than the sum of its proper divisors (52506277).

664544603 is a wasteful number, since it uses less digits than its factorization.

664544603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3226.

The product of its (nonzero) digits is 207360, while the sum is 38.

The square root of 664544603 is about 25778.7626351615. The cubic root of 664544603 is about 872.6525828445.

The spelling of 664544603 in words is "six hundred sixty-four million, five hundred forty-four thousand, six hundred three".