663521332 has 6 divisors (see below), whose sum is σ = 1161162338. Its totient is φ = 331760664.

The previous prime is 663521311. The next prime is 663521357. The reversal of 663521332 is 233125366.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 541772176 + 121749156 = 23276^2 + 11034^2 .

It is a junction number, because it is equal to n+sod(n) for n = 663521294 and 663521303.

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, 82940163 + ... + 82940170.

Almost surely, 2^663521332 is an apocalyptic number.

It is an amenable number.

663521332 is a deficient number, since it is larger than the sum of its proper divisors (497641006).

663521332 is a wasteful number, since it uses less digits than its factorization.

663521332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165880337 (or 165880335 counting only the distinct ones).

The product of its digits is 19440, while the sum is 31.

The square root of 663521332 is about 25758.9078184616. The cubic root of 663521332 is about 872.2044469840.

Adding to 663521332 its reverse (233125366), we get a palindrome (896646698).

The spelling of 663521332 in words is "six hundred sixty-three million, five hundred twenty-one thousand, three hundred thirty-two".