663312817280 has 128 divisors (see below), whose sum is σ = 1630896768000. Its totient is φ = 257788514304.

The previous prime is 663312817273. The next prime is 663312817283. The reversal of 663312817280 is 82718213366.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (663312817283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17006441 + ... + 17045399.

It is an arithmetic number, because the mean of its divisors is an integer number (12741381000).

Almost surely, 2^663312817280 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 663312817280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815448384000).

663312817280 is an abundant number, since it is smaller than the sum of its proper divisors (967583950720).

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

663312817280 is a wasteful number, since it uses less digits than its factorization.

663312817280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39734 (or 39722 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 663312817280 in words is "six hundred sixty-three billion, three hundred twelve million, eight hundred seventeen thousand, two hundred eighty".