663660312 has 96 divisors (see below), whose sum is σ = 1949126400. Its totient is φ = 187742016.

The previous prime is 663660311. The next prime is 663660313. The reversal of 663660312 is 213066366.

It is a happy number.

663660312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (663660311) and next prime (663660313).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663660311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118389 + ... + 123867.

It is an arithmetic number, because the mean of its divisors is an integer number (20303400).

Almost surely, 2^663660312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663660312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (974563200).

663660312 is an abundant number, since it is smaller than the sum of its proper divisors (1285466088).

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

663660312 is a wasteful number, since it uses less digits than its factorization.

663660312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5605 (or 5594 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 663660312 is about 25761.6053847581. The cubic root of 663660312 is about 872.2653395309.

The spelling of 663660312 in words is "six hundred sixty-three million, six hundred sixty thousand, three hundred twelve".