664725059 has 2 divisors, whose sum is σ = 664725060. Its totient is φ = 664725058.

The previous prime is 664725053. The next prime is 664725067. The reversal of 664725059 is 950527466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664725059 - 2⁴ = 664725043 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (664725053) 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, 332362529 + 332362530.

It is an arithmetic number, because the mean of its divisors is an integer number (332362530).

Almost surely, 2^664725059 is an apocalyptic number.

664725059 is a deficient number, since it is larger than the sum of its proper divisors (1).

664725059 is an equidigital number, since it uses as much as digits as its factorization.

664725059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 44.

The square root of 664725059 is about 25782.2624879974. The cubic root of 664725059 is about 872.7315648230.

The spelling of 664725059 in words is "six hundred sixty-four million, seven hundred twenty-five thousand, fifty-nine".