6643800011 has 16 divisors (see below), whose sum is σ = 6849722880. Its totient is φ = 6440421120.

The previous prime is 6643799969. The next prime is 6643800013. The reversal of 6643800011 is 1100083466.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6643800011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6643800013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3516155 + ... + 3518043.

It is an arithmetic number, because the mean of its divisors is an integer number (428107680).

Almost surely, 2^6643800011 is an apocalyptic number.

6643800011 is a deficient number, since it is larger than the sum of its proper divisors (205922869).

6643800011 is a wasteful number, since it uses less digits than its factorization.

6643800011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 6643800011 is about 81509.5087152413. The cubic root of 6643800011 is about 1879.9177581158.

Adding to 6643800011 its reverse (1100083466), we get a palindrome (7743883477).

The spelling of 6643800011 in words is "six billion, six hundred forty-three million, eight hundred thousand, eleven".