664563205 has 4 divisors (see below), whose sum is σ = 797475852. Its totient is φ = 531650560.

The previous prime is 664563203. The next prime is 664563223. The reversal of 664563205 is 502365466.

664563205 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, and also an emirpimes, since its reverse is a distinct semiprime: 502365466 = 2 ⋅251182733.

It can be written as a sum of positive squares in 2 ways, for example, as 411562369 + 253000836 = 20287^2 + 15906^2 .

It is not a de Polignac number, because 664563205 - 2¹ = 664563203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664563203) 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, 66456316 + ... + 66456325.

It is an arithmetic number, because the mean of its divisors is an integer number (199368963).

Almost surely, 2^664563205 is an apocalyptic number.

It is an amenable number.

664563205 is a deficient number, since it is larger than the sum of its proper divisors (132912647).

664563205 is a wasteful number, since it uses less digits than its factorization.

664563205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132912646.

The product of its (nonzero) digits is 129600, while the sum is 37.

The square root of 664563205 is about 25779.1234335072. The cubic root of 664563205 is about 872.6607252284.

The spelling of 664563205 in words is "six hundred sixty-four million, five hundred sixty-three thousand, two hundred five".