6643345664611 has 4 divisors (see below), whose sum is σ = 6643442520000. Its totient is φ = 6643248809224.

The previous prime is 6643345664609. The next prime is 6643345664617. The reversal of 6643345664611 is 1164665433466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6643345664611 - 2¹ = 6643345664609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6643345664617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48324736 + ... + 48462013.

It is an arithmetic number, because the mean of its divisors is an integer number (1660860630000).

Almost surely, 2^{6643345664611} is an apocalyptic number.

6643345664611 is a deficient number, since it is larger than the sum of its proper divisors (96855389).

6643345664611 is an equidigital number, since it uses as much as digits as its factorization.

6643345664611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96855388.

The product of its digits is 22394880, while the sum is 55.

The spelling of 6643345664611 in words is "six trillion, six hundred forty-three billion, three hundred forty-five million, six hundred sixty-four thousand, six hundred eleven".