663775985856 has 448 divisors, whose sum is σ = 1925650907136. Its totient is φ = 201180672000.

The previous prime is 663775985771. The next prime is 663775985863. The reversal of 663775985856 is 658589577366.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3369421150 + ... + 3369421346.

Almost surely, 2^663775985856 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 663775985856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (962825453568).

663775985856 is an abundant number, since it is smaller than the sum of its proper divisors (1261874921280).

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

663775985856 is a wasteful number, since it uses less digits than its factorization.

663775985856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580 (or 570 counting only the distinct ones).

The product of its digits is 2286144000, while the sum is 75.

The spelling of 663775985856 in words is "six hundred sixty-three billion, seven hundred seventy-five million, nine hundred eighty-five thousand, eight hundred fifty-six".