664742333 has 4 divisors (see below), whose sum is σ = 682708380. Its totient is φ = 646776288.

The previous prime is 664742249. The next prime is 664742359. The reversal of 664742333 is 333247466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 333247466 = 2 ⋅166623733.

It can be written as a sum of positive squares in 2 ways, for example, as 621155929 + 43586404 = 24923^2 + 6602^2 .

It is a cyclic number.

It is not a de Polignac number, because 664742333 - 2²⁰ = 663693757 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 (664742233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8982968 + ... + 8983041.

It is an arithmetic number, because the mean of its divisors is an integer number (170677095).

Almost surely, 2^664742333 is an apocalyptic number.

It is an amenable number.

664742333 is a deficient number, since it is larger than the sum of its proper divisors (17966047).

664742333 is a wasteful number, since it uses less digits than its factorization.

664742333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17966046.

The product of its digits is 217728, while the sum is 38.

The square root of 664742333 is about 25782.5974835741. The cubic root of 664742333 is about 872.7391245573.

Adding to 664742333 its reverse (333247466), we get a palindrome (997989799).

The spelling of 664742333 in words is "six hundred sixty-four million, seven hundred forty-two thousand, three hundred thirty-three".