665330212 has 6 divisors (see below), whose sum is σ = 1164327878. Its totient is φ = 332665104.

The previous prime is 665330143. The next prime is 665330221. The reversal of 665330212 is 212033566.

It can be written as a sum of positive squares in only one way, i.e., 553943296 + 111386916 = 23536^2 + 10554^2 .

It is an unprimeable number.

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, 83166273 + ... + 83166280.

Almost surely, 2^665330212 is an apocalyptic number.

It is an amenable number.

665330212 is a deficient number, since it is larger than the sum of its proper divisors (498997666).

665330212 is a wasteful number, since it uses less digits than its factorization.

665330212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166332557 (or 166332555 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 665330212 is about 25793.9956579046. The cubic root of 665330212 is about 872.9963238789.

Adding to 665330212 its reverse (212033566), we get a palindrome (877363778).

The spelling of 665330212 in words is "six hundred sixty-five million, three hundred thirty thousand, two hundred twelve".