6663566065968 has 720 divisors, whose sum is σ = 23393918129920. Its totient is φ = 1796117524992.

The previous prime is 6663566065931. The next prime is 6663566066023. The reversal of 6663566065968 is 8695606653666.

It is a super-2 number, since 2×6663566065968² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 6663566065896 and 6663566065905.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3867419955 + ... + 3867421677.

Almost surely, 2^{6663566065968} 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 6663566065968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11696959064960).

6663566065968 is an abundant number, since it is smaller than the sum of its proper divisors (16730352063952).

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

6663566065968 is a wasteful number, since it uses less digits than its factorization.

6663566065968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058 (or 2031 counting only the distinct ones).

The product of its (nonzero) digits is 1511654400, while the sum is 72.

The spelling of 6663566065968 in words is "six trillion, six hundred sixty-three billion, five hundred sixty-six million, sixty-five thousand, nine hundred sixty-eight".