6666888888 has 96 divisors (see below), whose sum is σ = 19712160000. Its totient is φ = 2018779200.

The previous prime is 6666888883. The next prime is 6666888937. The reversal of 6666888888 is 8888886666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

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 (6666888883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1581103 + ... + 1585313.

It is an arithmetic number, because the mean of its divisors is an integer number (205335000).

Almost surely, 2^6666888888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6666888888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9856080000).

6666888888 is an abundant number, since it is smaller than the sum of its proper divisors (13045271112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6666888888 is a wasteful number, since it uses less digits than its factorization.

6666888888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6233 (or 6226 counting only the distinct ones).

The product of its digits is 339738624, while the sum is 72.

The square root of 6666888888 is about 81651.0189036242. The cubic root of 6666888888 is about 1882.0929693578.

It can be divided in two parts, 666688 and 8888, that added together give a palindrome (675576).

The spelling of 6666888888 in words is "six billion, six hundred sixty-six million, eight hundred eighty-eight thousand, eight hundred eighty-eight".