663216212 has 6 divisors (see below), whose sum is σ = 1160628378. Its totient is φ = 331608104.

The previous prime is 663216209. The next prime is 663216251. The reversal of 663216212 is 212612366.

It can be written as a sum of positive squares in only one way, i.e., 389115076 + 274101136 = 19726^2 + 16556^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82902023 + ... + 82902030.

It is an arithmetic number, because the mean of its divisors is an integer number (193438063).

Almost surely, 2^663216212 is an apocalyptic number.

It is an amenable number.

663216212 is a deficient number, since it is larger than the sum of its proper divisors (497412166).

663216212 is a wasteful number, since it uses less digits than its factorization.

663216212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165804057 (or 165804055 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 663216212 is about 25752.9845260700. The cubic root of 663216212 is about 872.0707322053.

Adding to 663216212 its reverse (212612366), we get a palindrome (875828578).

The spelling of 663216212 in words is "six hundred sixty-three million, two hundred sixteen thousand, two hundred twelve".