665323212 has 24 divisors (see below), whose sum is σ = 1556755200. Its totient is φ = 221155216.

The previous prime is 665323207. The next prime is 665323223. The reversal of 665323212 is 212323566.

It is a self number, because there is not a number n which added to its sum of digits gives 665323212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72912 + ... + 81527.

It is an arithmetic number, because the mean of its divisors is an integer number (64864800).

Almost surely, 2^665323212 is an apocalyptic number.

It is an amenable number.

665323212 is an abundant number, since it is smaller than the sum of its proper divisors (891431988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665323212 is a wasteful number, since it uses less digits than its factorization.

665323212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154805 (or 154803 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 665323212 is about 25793.8599670542. The cubic root of 665323212 is about 872.9932622435.

Adding to 665323212 its reverse (212323566), we get a palindrome (877646778).

The spelling of 665323212 in words is "six hundred sixty-five million, three hundred twenty-three thousand, two hundred twelve".