664322243 has 8 divisors (see below), whose sum is σ = 757507968. Its totient is φ = 577148544.

The previous prime is 664322189. The next prime is 664322279. The reversal of 664322243 is 342223466.

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

It is a cyclic number.

It is not a de Polignac number, because 664322243 - 2¹⁰ = 664321219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664322143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1502771 + ... + 1503212.

It is an arithmetic number, because the mean of its divisors is an integer number (94688496).

Almost surely, 2^664322243 is an apocalyptic number.

664322243 is a deficient number, since it is larger than the sum of its proper divisors (93185725).

664322243 is a wasteful number, since it uses less digits than its factorization.

664322243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006013.

The product of its digits is 41472, while the sum is 32.

The square root of 664322243 is about 25774.4494218596. The cubic root of 664322243 is about 872.5552406576. Note that the first 3 decimals are identical.

The spelling of 664322243 in words is "six hundred sixty-four million, three hundred twenty-two thousand, two hundred forty-three".