664013305 has 4 divisors (see below), whose sum is σ = 796815972. Its totient is φ = 531210640.

The previous prime is 664013303. The next prime is 664013323. The reversal of 664013305 is 503310466.

664013305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85322169 + 578691136 = 9237^2 + 24056^2 .

It is not a de Polignac number, because 664013305 - 2¹ = 664013303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664013303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66401326 + ... + 66401335.

It is an arithmetic number, because the mean of its divisors is an integer number (199203993).

Almost surely, 2^664013305 is an apocalyptic number.

It is an amenable number.

664013305 is a deficient number, since it is larger than the sum of its proper divisors (132802667).

664013305 is a wasteful number, since it uses less digits than its factorization.

664013305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132802666.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 664013305 is about 25768.4556192256. The cubic root of 664013305 is about 872.4199612952.

The spelling of 664013305 in words is "six hundred sixty-four million, thirteen thousand, three hundred five".