664050565 has 4 divisors (see below), whose sum is σ = 796860684. Its totient is φ = 531240448.

The previous prime is 664050553. The next prime is 664050571. The reversal of 664050565 is 565050466.

664050565 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 99560484 + 564490081 = 9978^2 + 23759^2 .

It is a cyclic number.

It is not a de Polignac number, because 664050565 - 2¹³ = 664042373 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, 66405052 + ... + 66405061.

It is an arithmetic number, because the mean of its divisors is an integer number (199215171).

Almost surely, 2^664050565 is an apocalyptic number.

It is an amenable number.

664050565 is a deficient number, since it is larger than the sum of its proper divisors (132810119).

664050565 is a wasteful number, since it uses less digits than its factorization.

664050565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132810118.

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 664050565 is about 25769.1785860551. The cubic root of 664050565 is about 872.4362791208.

Subtracting from 664050565 its reverse (565050466), we obtain a palindrome (99000099).

The spelling of 664050565 in words is "six hundred sixty-four million, fifty thousand, five hundred sixty-five".