663502855680 has 800 divisors, whose sum is σ = 2782443787200. Its totient is φ = 147945553920.

The previous prime is 663502855669. The next prime is 663502855747. The reversal of 663502855680 is 86558205366.

663502855680 is a `hidden beast` number, since 6 + 6 + 3 + 5 + 0 + 2 + 8 + 556 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 59506746 + ... + 59517894.

It is an arithmetic number, because the mean of its divisors is an integer number (3478054734).

Almost surely, 2^663502855680 is an apocalyptic number.

663502855680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663502855680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1391221893600).

663502855680 is an abundant number, since it is smaller than the sum of its proper divisors (2118940931520).

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

663502855680 is a wasteful number, since it uses less digits than its factorization.

663502855680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11232 (or 11207 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 54.

The spelling of 663502855680 in words is "six hundred sixty-three billion, five hundred two million, eight hundred fifty-five thousand, six hundred eighty".