663633252 has 36 divisors (see below), whose sum is σ = 1678691196. Its totient is φ = 221056320.

The previous prime is 663633247. The next prime is 663633253. The reversal of 663633252 is 252336366.

It can be written as a sum of positive squares in 2 ways, for example, as 358572096 + 305061156 = 18936^2 + 17466^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (663633253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53302 + ... + 64562.

It is an arithmetic number, because the mean of its divisors is an integer number (46630311).

Almost surely, 2^663633252 is an apocalyptic number.

It is an amenable number.

663633252 is an abundant number, since it is smaller than the sum of its proper divisors (1015057944).

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

663633252 is a wasteful number, since it uses less digits than its factorization.

663633252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12908 (or 12903 counting only the distinct ones).

The product of its digits is 116640, while the sum is 36.

The square root of 663633252 is about 25761.0801792161. The cubic root of 663633252 is about 872.2534841583.

The spelling of 663633252 in words is "six hundred sixty-three million, six hundred thirty-three thousand, two hundred fifty-two".