6668736666 has 16 divisors (see below), whose sum is σ = 13370738688. Its totient is φ = 2217368000.

The previous prime is 6668736637. The next prime is 6668736671. The reversal of 6668736666 is 6666378666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1383450 + ... + 1388261.

It is an arithmetic number, because the mean of its divisors is an integer number (835671168).

Almost surely, 2^6668736666 is an apocalyptic number.

6668736666 is an abundant number, since it is smaller than the sum of its proper divisors (6702002022).

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

6668736666 is a wasteful number, since it uses less digits than its factorization.

6668736666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2772117.

The product of its digits is 47029248, while the sum is 60.

The square root of 6668736666 is about 81662.3332142794. Note that the first 3 decimals coincide. The cubic root of 6668736666 is about 1882.2668319996.

The spelling of 6668736666 in words is "six billion, six hundred sixty-eight million, seven hundred thirty-six thousand, six hundred sixty-six".