6664718943 has 12 divisors (see below), whose sum is σ = 9887000968. Its totient is φ = 4323060720.

The previous prime is 6664718911. The next prime is 6664718953. The reversal of 6664718943 is 3498174666.

It is not a de Polignac number, because 6664718943 - 2⁵ = 6664718911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6664718943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664718953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10006753 + ... + 10007418.

Almost surely, 2^6664718943 is an apocalyptic number.

6664718943 is a deficient number, since it is larger than the sum of its proper divisors (3222282025).

6664718943 is a wasteful number, since it uses less digits than its factorization.

6664718943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20014214 (or 20014211 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 6664718943 is about 81637.7298986198. The cubic root of 6664718943 is about 1881.8887520950. Note that the first 3 decimals are identical.

The spelling of 6664718943 in words is "six billion, six hundred sixty-four million, seven hundred eighteen thousand, nine hundred forty-three".