66888888899 has 16 divisors (see below), whose sum is σ = 76572291840. Its totient is φ = 57237541920.

The previous prime is 66888888893. The next prime is 66888888929. The reversal of 66888888899 is 99888888866.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66888888899 is a prime.

66888888899 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66888888899.

It is not an unprimeable number, because it can be changed into a prime (66888888893) 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, 13219232 + ... + 13224290.

It is an arithmetic number, because the mean of its divisors is an integer number (4785768240).

Almost surely, 2^66888888899 is an apocalyptic number.

66888888899 is a deficient number, since it is larger than the sum of its proper divisors (9683402941).

66888888899 is a wasteful number, since it uses less digits than its factorization.

66888888899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7850.

The product of its digits is 6115295232, while the sum is 86.

The spelling of 66888888899 in words is "sixty-six billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred ninety-nine".