6666906845 has 16 divisors (see below), whose sum is σ = 8354430720. Its totient is φ = 5097780864.

The previous prime is 6666906821. The next prime is 6666906859. The reversal of 6666906845 is 5486096666.

It is a cyclic number.

It is not a de Polignac number, because 6666906845 - 2⁶ = 6666906781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136001 + ... + 178409.

It is an arithmetic number, because the mean of its divisors is an integer number (522151920).

Almost surely, 2^6666906845 is an apocalyptic number.

It is an amenable number.

6666906845 is a deficient number, since it is larger than the sum of its proper divisors (1687523875).

6666906845 is a wasteful number, since it uses less digits than its factorization.

6666906845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43804.

The product of its (nonzero) digits is 11197440, while the sum is 56.

The square root of 6666906845 is about 81651.1288654358. The cubic root of 6666906845 is about 1882.0946591371.

The spelling of 6666906845 in words is "six billion, six hundred sixty-six million, nine hundred six thousand, eight hundred forty-five".