664544133 has 24 divisors (see below), whose sum is σ = 1102277280. Its totient is φ = 381555360.

The previous prime is 664544131. The next prime is 664544143. The reversal of 664544133 is 331445466.

664544133 is a `hidden beast` number, since 6 + 645 + 4 + 4 + 1 + 3 + 3 = 666.

It is not a de Polignac number, because 664544133 - 2¹ = 664544131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664544131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174766 + ... + 178527.

It is an arithmetic number, because the mean of its divisors is an integer number (45928220).

Almost surely, 2^664544133 is an apocalyptic number.

It is an amenable number.

664544133 is a deficient number, since it is larger than the sum of its proper divisors (437733147).

664544133 is a wasteful number, since it uses less digits than its factorization.

664544133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353329 (or 353326 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 664544133 is about 25778.7535191289. The cubic root of 664544133 is about 872.6523771162.

Adding to 664544133 its reverse (331445466), we get a palindrome (995989599).

The spelling of 664544133 in words is "six hundred sixty-four million, five hundred forty-four thousand, one hundred thirty-three".