6663639799 has 2 divisors, whose sum is σ = 6663639800. Its totient is φ = 6663639798.

The previous prime is 6663639797. The next prime is 6663639823. The reversal of 6663639799 is 9979363666.

6663639799 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6663639799 - 2¹ = 6663639797 is a prime.

Together with 6663639797, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6663639799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6663639791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3331819899 + 3331819900.

It is an arithmetic number, because the mean of its divisors is an integer number (3331819900).

Almost surely, 2^6663639799 is an apocalyptic number.

6663639799 is a deficient number, since it is larger than the sum of its proper divisors (1).

6663639799 is an equidigital number, since it uses as much as digits as its factorization.

6663639799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59521392, while the sum is 64.

The square root of 6663639799 is about 81631.1202850972. The cubic root of 6663639799 is about 1881.7871754898.

The spelling of 6663639799 in words is "six billion, six hundred sixty-three million, six hundred thirty-nine thousand, seven hundred ninety-nine".