6646340643066 has 224 divisors, whose sum is σ = 15960162628800. Its totient is φ = 2067610406400.

The previous prime is 6646340643031. The next prime is 6646340643121. The reversal of 6646340643066 is 6603460436466.

6646340643066 is a `hidden beast` number, since 66 + 463 + 4 + 0 + 64 + 3 + 0 + 66 = 666.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 1725872041 + ... + 1725875891.

Almost surely, 2^{6646340643066} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6646340643066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7980081314400).

6646340643066 is an abundant number, since it is smaller than the sum of its proper divisors (9313821985734).

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

6646340643066 is a wasteful number, since it uses less digits than its factorization.

6646340643066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4456 (or 4441 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 54.

The spelling of 6646340643066 in words is "six trillion, six hundred forty-six billion, three hundred forty million, six hundred forty-three thousand, sixty-six".