664422065 has 8 divisors (see below), whose sum is σ = 810377448. Its totient is φ = 522823680.

The previous prime is 664422053. The next prime is 664422071. The reversal of 664422065 is 560224466.

664422065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 61277584 + 603144481 = 7828^2 + 24559^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664422065 - 2⁸ = 664421809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1088912 + ... + 1089521.

It is an arithmetic number, because the mean of its divisors is an integer number (101297181).

Almost surely, 2^664422065 is an apocalyptic number.

It is an amenable number.

664422065 is a deficient number, since it is larger than the sum of its proper divisors (145955383).

664422065 is a wasteful number, since it uses less digits than its factorization.

664422065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178499.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 664422065 is about 25776.3858017372. The cubic root of 664422065 is about 872.5989422637.

The spelling of 664422065 in words is "six hundred sixty-four million, four hundred twenty-two thousand, sixty-five".