664611212 has 24 divisors (see below), whose sum is σ = 1217689200. Its totient is φ = 316976576.

The previous prime is 664611187. The next prime is 664611239. The reversal of 664611212 is 212116466.

664611212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×664611212³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24887 + ... + 44142.

It is an arithmetic number, because the mean of its divisors is an integer number (50737050).

Almost surely, 2^664611212 is an apocalyptic number.

It is an amenable number.

664611212 is a deficient number, since it is larger than the sum of its proper divisors (553077988).

664611212 is a wasteful number, since it uses less digits than its factorization.

664611212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69145 (or 69143 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 664611212 is about 25780.0545383442. The cubic root of 664611212 is about 872.6817379349.

Adding to 664611212 its reverse (212116466), we get a palindrome (876727678).

The spelling of 664611212 in words is "six hundred sixty-four million, six hundred eleven thousand, two hundred twelve".