664035565 has 4 divisors (see below), whose sum is σ = 796842684. Its totient is φ = 531228448.

The previous prime is 664035551. The next prime is 664035611. The reversal of 664035565 is 565530466.

It is a happy number.

664035565 is digitally balanced in base 2 and base 6, because in such bases 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 257730916 + 406304649 = 16054^2 + 20157^2 .

It is a cyclic number.

It is not a de Polignac number, because 664035565 - 2¹³ = 664027373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66403552 + ... + 66403561.

It is an arithmetic number, because the mean of its divisors is an integer number (199210671).

Almost surely, 2^664035565 is an apocalyptic number.

It is an amenable number.

664035565 is a deficient number, since it is larger than the sum of its proper divisors (132807119).

664035565 is a wasteful number, since it uses less digits than its factorization.

664035565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132807118.

The product of its (nonzero) digits is 324000, while the sum is 40.

The square root of 664035565 is about 25768.8875390460. The cubic root of 664035565 is about 872.4297100213.

The spelling of 664035565 in words is "six hundred sixty-four million, thirty-five thousand, five hundred sixty-five".