6666009999 has 16 divisors (see below), whose sum is σ = 9792019584. Its totient is φ = 4000004000.

The previous prime is 6666009979. The next prime is 6666010003. The reversal of 6666009999 is 9999006666.

It is not a de Polignac number, because 6666009999 - 2⁷ = 6666009871 is a prime.

6666009999 is a strobogrammatic number because it is the same when read upside-down.

6666009999 is a modest number, since divided by 9999 gives 6666 as remainder.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666009979) 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 in 15 ways as a sum of consecutive naturals, for example, 996669 + ... + 1003334.

It is an arithmetic number, because the mean of its divisors is an integer number (612001224).

Almost surely, 2^6666009999 is an apocalyptic number.

6666009999 is a deficient number, since it is larger than the sum of its proper divisors (3126009585).

6666009999 is a wasteful number, since it uses less digits than its factorization.

6666009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000118.

The product of its (nonzero) digits is 8503056, while the sum is 60.

The square root of 6666009999 is about 81645.6367419595. The cubic root of 6666009999 is about 1882.0102609397.

The spelling of 6666009999 in words is "six billion, six hundred sixty-six million, nine thousand, nine hundred ninety-nine".