6666066680 has 128 divisors (see below), whose sum is σ = 18495146880. Its totient is φ = 2105671680.

The previous prime is 6666066653. The next prime is 6666066683. The reversal of 6666066680 is 866606666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666066683) 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, 2331812 + ... + 2334668.

It is an arithmetic number, because the mean of its divisors is an integer number (144493335).

Almost surely, 2^6666066680 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 6666066680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9247573440).

6666066680 is an abundant number, since it is smaller than the sum of its proper divisors (11829080200).

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

6666066680 is a wasteful number, since it uses less digits than its factorization.

6666066680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529 (or 3525 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 50.

The square root of 6666066680 is about 81645.9838571378. The cubic root of 6666066680 is about 1882.0155951612.

The spelling of 6666066680 in words is "six billion, six hundred sixty-six million, sixty-six thousand, six hundred eighty".