6663816529920 has 1152 divisors, whose sum is σ = 26228211609600. Its totient is φ = 1550558822400.

The previous prime is 6663816529919. The next prime is 6663816529949. The reversal of 6663816529920 is 299256183666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a super-3 number, since 3×6663816529920³ (a number of 39 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2571907825 + ... + 2571910415.

It is an arithmetic number, because the mean of its divisors is an integer number (22767544800).

Almost surely, 2^{6663816529920} is an apocalyptic number.

6663816529920 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 6663816529920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13114105804800).

6663816529920 is an abundant number, since it is smaller than the sum of its proper divisors (19564395079680).

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

6663816529920 is a wasteful number, since it uses less digits than its factorization.

6663816529920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737 (or 2714 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 63.

The spelling of 6663816529920 in words is "six trillion, six hundred sixty-three billion, eight hundred sixteen million, five hundred twenty-nine thousand, nine hundred twenty".