664523289 has 6 divisors (see below), whose sum is σ = 959866986. Its totient is φ = 443015520.

The previous prime is 664523269. The next prime is 664523303. The reversal of 664523289 is 982325466.

It can be written as a sum of positive squares in only one way, i.e., 408363264 + 256160025 = 20208^2 + 16005^2 .

It is not a de Polignac number, because 664523289 - 2⁵ = 664523257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664523269) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36917952 + ... + 36917969.

It is an arithmetic number, because the mean of its divisors is an integer number (159977831).

Almost surely, 2^664523289 is an apocalyptic number.

It is an amenable number.

664523289 is a deficient number, since it is larger than the sum of its proper divisors (295343697).

664523289 is a wasteful number, since it uses less digits than its factorization.

664523289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73835927 (or 73835924 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 664523289 is about 25778.3492295376. The cubic root of 664523289 is about 872.6432531893.

The spelling of 664523289 in words is "six hundred sixty-four million, five hundred twenty-three thousand, two hundred eighty-nine".