66668889999 has 8 divisors (see below), whose sum is σ = 88929354112. Its totient is φ = 44427176280.

The previous prime is 66668889997. The next prime is 66668890007. The reversal of 66668889999 is 99998886666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66668889999 - 2¹ = 66668889997 is a prime.

66668889999 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (66668889997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4679299 + ... + 4693524.

It is an arithmetic number, because the mean of its divisors is an integer number (11116169264).

Almost surely, 2^66668889999 is an apocalyptic number.

66668889999 is a deficient number, since it is larger than the sum of its proper divisors (22260464113).

66668889999 is a wasteful number, since it uses less digits than its factorization.

66668889999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9375197.

The product of its digits is 4353564672, while the sum is 84.

The spelling of 66668889999 in words is "sixty-six billion, six hundred sixty-eight million, eight hundred eighty-nine thousand, nine hundred ninety-nine".