6663556320 has 192 divisors, whose sum is σ = 21991979520. Its totient is φ = 1692776448.

The previous prime is 6663556303. The next prime is 6663556327. The reversal of 6663556320 is 236553666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663556327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3056991 + ... + 3059169.

It is an arithmetic number, because the mean of its divisors is an integer number (114541560).

Almost surely, 2^6663556320 is an apocalyptic number.

6663556320 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 6663556320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10995989760).

6663556320 is an abundant number, since it is smaller than the sum of its proper divisors (15328423200).

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

6663556320 is a wasteful number, since it uses less digits than its factorization.

6663556320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497 (or 2489 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 42.

The square root of 6663556320 is about 81630.6089650200. The cubic root of 6663556320 is about 1881.7793174036.

The spelling of 6663556320 in words is "six billion, six hundred sixty-three million, five hundred fifty-six thousand, three hundred twenty".