6664940806 has 4 divisors (see below), whose sum is σ = 9997411212. Its totient is φ = 3332470402.

The previous prime is 6664940773. The next prime is 6664940819. The reversal of 6664940806 is 6080494666.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6664940806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1666235200 + ... + 1666235203.

It is an arithmetic number, because the mean of its divisors is an integer number (2499352803).

Almost surely, 2^6664940806 is an apocalyptic number.

6664940806 is a deficient number, since it is larger than the sum of its proper divisors (3332470406).

6664940806 is a wasteful number, since it uses less digits than its factorization.

6664940806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332470405.

The product of its (nonzero) digits is 1492992, while the sum is 49.

The square root of 6664940806 is about 81639.0887136793. The cubic root of 6664940806 is about 1881.9096340384.

The spelling of 6664940806 in words is "six billion, six hundred sixty-four million, nine hundred forty thousand, eight hundred six".