664355803 has 2 divisors, whose sum is σ = 664355804. Its totient is φ = 664355802.

The previous prime is 664355789. The next prime is 664355807. The reversal of 664355803 is 308553466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664355803 is a prime.

It is not a weakly prime, because it can be changed into another prime (664355807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332177901 + 332177902.

It is an arithmetic number, because the mean of its divisors is an integer number (332177902).

Almost surely, 2^664355803 is an apocalyptic number.

664355803 is a deficient number, since it is larger than the sum of its proper divisors (1).

664355803 is an equidigital number, since it uses as much as digits as its factorization.

664355803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 664355803 is about 25775.1004459730. The cubic root of 664355803 is about 872.5699335575.

The spelling of 664355803 in words is "six hundred sixty-four million, three hundred fifty-five thousand, eight hundred three".