6668698999 has 2 divisors, whose sum is σ = 6668699000. Its totient is φ = 6668698998.

The previous prime is 6668698997. The next prime is 6668699029. The reversal of 6668698999 is 9998968666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6668698999 - 2¹ = 6668698997 is a prime.

Together with 6668698997, it forms a pair of twin primes.

6668698999 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6668698997) 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, 3334349499 + 3334349500.

It is an arithmetic number, because the mean of its divisors is an integer number (3334349500).

Almost surely, 2^6668698999 is an apocalyptic number.

6668698999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668698999 is an equidigital number, since it uses as much as digits as its factorization.

6668698999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544195584, while the sum is 76.

The square root of 6668698999 is about 81662.1025874304. The cubic root of 6668698999 is about 1882.2632881260.

The spelling of 6668698999 in words is "six billion, six hundred sixty-eight million, six hundred ninety-eight thousand, nine hundred ninety-nine".