664730057 has 2 divisors, whose sum is σ = 664730058. Its totient is φ = 664730056.

The previous prime is 664729999. The next prime is 664730063. The reversal of 664730057 is 750037466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634082761 + 30647296 = 25181^2 + 5536^2 .

It is a cyclic number.

It is not a de Polignac number, because 664730057 - 2²⁰ = 663681481 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664730057.

It is not a weakly prime, because it can be changed into another prime (664730357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332365028 + 332365029.

It is an arithmetic number, because the mean of its divisors is an integer number (332365029).

Almost surely, 2^664730057 is an apocalyptic number.

It is an amenable number.

664730057 is a deficient number, since it is larger than the sum of its proper divisors (1).

664730057 is an equidigital number, since it uses as much as digits as its factorization.

664730057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 38.

The square root of 664730057 is about 25782.3594149178. The cubic root of 664730057 is about 872.7337521441.

The spelling of 664730057 in words is "six hundred sixty-four million, seven hundred thirty thousand, fifty-seven".