6668137999 has 2 divisors, whose sum is σ = 6668138000. Its totient is φ = 6668137998.

The previous prime is 6668137991. The next prime is 6668138041. The reversal of 6668137999 is 9997318666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6668137999 - 2³ = 6668137991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6668137999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6668137991) 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, 3334068999 + 3334069000.

It is an arithmetic number, because the mean of its divisors is an integer number (3334069000).

Almost surely, 2^6668137999 is an apocalyptic number.

6668137999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668137999 is an equidigital number, since it uses as much as digits as its factorization.

6668137999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26453952, while the sum is 64.

The square root of 6668137999 is about 81658.6676293460. The cubic root of 6668137999 is about 1882.2105052511.

The spelling of 6668137999 in words is "six billion, six hundred sixty-eight million, one hundred thirty-seven thousand, nine hundred ninety-nine".