663521212 has 6 divisors (see below), whose sum is σ = 1161162128. Its totient is φ = 331760604.

The previous prime is 663521207. The next prime is 663521219. The reversal of 663521212 is 212125366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663521219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82940148 + ... + 82940155.

Almost surely, 2^663521212 is an apocalyptic number.

It is an amenable number.

663521212 is a deficient number, since it is larger than the sum of its proper divisors (497640916).

663521212 is a wasteful number, since it uses less digits than its factorization.

663521212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165880307 (or 165880305 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 663521212 is about 25758.9054891701. The cubic root of 663521212 is about 872.2043944036.

Adding to 663521212 its reverse (212125366), we get a palindrome (875646578).

The spelling of 663521212 in words is "six hundred sixty-three million, five hundred twenty-one thousand, two hundred twelve".