663456880 has 80 divisors (see below), whose sum is σ = 1570729824. Its totient is φ = 260582400.

The previous prime is 663456863. The next prime is 663456881. The reversal of 663456880 is 88654366.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 663456880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663456881) 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, 1268299 + ... + 1268821.

Almost surely, 2^663456880 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 663456880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (785364912).

663456880 is an abundant number, since it is smaller than the sum of its proper divisors (907272944).

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

663456880 is a wasteful number, since it uses less digits than its factorization.

663456880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 788 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 46.

The square root of 663456880 is about 25757.6567257194. The cubic root of 663456880 is about 872.1762051684.

The spelling of 663456880 in words is "six hundred sixty-three million, four hundred fifty-six thousand, eight hundred eighty".