6666668080 has 20 divisors (see below), whose sum is σ = 15500003472. Its totient is φ = 2666667200.

The previous prime is 6666668077. The next prime is 6666668117. The reversal of 6666668080 is 808666666.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41666596 + ... + 41666755.

Almost surely, 2^6666668080 is an apocalyptic number.

It is an amenable number.

6666668080 is an abundant number, since it is smaller than the sum of its proper divisors (8833335392).

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

6666668080 is a wasteful number, since it uses less digits than its factorization.

6666668080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83333364 (or 83333358 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 52.

The square root of 6666668080 is about 81649.6667476359. Note that the first 3 decimals coincide. The cubic root of 6666668080 is about 1882.0721907618.

The spelling of 6666668080 in words is "six billion, six hundred sixty-six million, six hundred sixty-eight thousand, eighty".