664043533 has 2 divisors, whose sum is σ = 664043534. Its totient is φ = 664043532.

The previous prime is 664043531. The next prime is 664043543. The reversal of 664043533 is 335340466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663732169 + 311364 = 25763^2 + 558^2 .

It is a cyclic number.

It is not a de Polignac number, because 664043533 - 2¹ = 664043531 is a prime.

Together with 664043531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664043531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332021766 + 332021767.

It is an arithmetic number, because the mean of its divisors is an integer number (332021767).

Almost surely, 2^664043533 is an apocalyptic number.

It is an amenable number.

664043533 is a deficient number, since it is larger than the sum of its proper divisors (1).

664043533 is an equidigital number, since it uses as much as digits as its factorization.

664043533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 34.

The square root of 664043533 is about 25769.0421436265. The cubic root of 664043533 is about 872.4331995392.

Adding to 664043533 its reverse (335340466), we get a palindrome (999383999).

The spelling of 664043533 in words is "six hundred sixty-four million, forty-three thousand, five hundred thirty-three".