6666006663 has 72 divisors (see below), whose sum is σ = 10789109760. Its totient is φ = 3959297280.

The previous prime is 6666006647. The next prime is 6666006701. The reversal of 6666006663 is 3666006666.

It is not a de Polignac number, because 6666006663 - 2⁴ = 6666006647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666006163) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3788778 + ... + 3790536.

Almost surely, 2^6666006663 is an apocalyptic number.

6666006663 is a deficient number, since it is larger than the sum of its proper divisors (4123103097).

6666006663 is a wasteful number, since it uses less digits than its factorization.

6666006663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877 (or 1857 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 45.

The square root of 6666006663 is about 81645.6163122063. The cubic root of 6666006663 is about 1882.0099469894.

The spelling of 6666006663 in words is "six billion, six hundred sixty-six million, six thousand, six hundred sixty-three".