6666889999 has 32 divisors (see below), whose sum is σ = 8386560000. Its totient is φ = 5148563040.

The previous prime is 6666889991. The next prime is 6666890033. The reversal of 6666889999 is 9999886666.

It is a cyclic number.

It is not a de Polignac number, because 6666889999 - 2³ = 6666889991 is a prime.

6666889999 is a strobogrammatic number because it is the same when read upside-down.

It is a plaindrome in base 10.

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 (6666889991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6416122 + ... + 6417160.

It is an arithmetic number, because the mean of its divisors is an integer number (262080000).

Almost surely, 2^6666889999 is an apocalyptic number.

6666889999 is a deficient number, since it is larger than the sum of its proper divisors (1719670001).

6666889999 is a wasteful number, since it uses less digits than its factorization.

6666889999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723.

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

The square root of 6666889999 is about 81651.0257069683. The cubic root of 6666889999 is about 1882.0930739046.

The spelling of 6666889999 in words is "six billion, six hundred sixty-six million, eight hundred eighty-nine thousand, nine hundred ninety-nine".