664908533 has 4 divisors (see below), whose sum is σ = 664961388. Its totient is φ = 664855680.

The previous prime is 664908523. The next prime is 664908547. The reversal of 664908533 is 335809466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 381928849 + 282979684 = 19543^2 + 16822^2 .

It is a cyclic number.

It is not a de Polignac number, because 664908533 - 2¹⁴ = 664892149 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 (664908523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4535 + ... + 36747.

It is an arithmetic number, because the mean of its divisors is an integer number (166240347).

Almost surely, 2^664908533 is an apocalyptic number.

It is an amenable number.

664908533 is a deficient number, since it is larger than the sum of its proper divisors (52855).

664908533 is a wasteful number, since it uses less digits than its factorization.

664908533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52854.

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 664908533 is about 25785.8203864062. The cubic root of 664908533 is about 872.8118530660.

The spelling of 664908533 in words is "six hundred sixty-four million, nine hundred eight thousand, five hundred thirty-three".