664531211 has 8 divisors (see below), whose sum is σ = 686072064. Its totient is φ = 643178880.

The previous prime is 664531187. The next prime is 664531223. The reversal of 664531211 is 112135466.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664531211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664531291) 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 7 ways as a sum of consecutive naturals, for example, 39950 + ... + 54083.

It is an arithmetic number, because the mean of its divisors is an integer number (85759008).

Almost surely, 2^664531211 is an apocalyptic number.

664531211 is a deficient number, since it is larger than the sum of its proper divisors (21540853).

664531211 is a wasteful number, since it uses less digits than its factorization.

664531211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94261.

The product of its digits is 4320, while the sum is 29.

The square root of 664531211 is about 25778.5028851561. The cubic root of 664531211 is about 872.6467208643.

Adding to 664531211 its reverse (112135466), we get a palindrome (776666677).

The spelling of 664531211 in words is "six hundred sixty-four million, five hundred thirty-one thousand, two hundred eleven".