6666743943 has 24 divisors (see below), whose sum is σ = 9736101648. Its totient is φ = 4395474432.

The previous prime is 6666743939. The next prime is 6666743971. The reversal of 6666743943 is 3493476666.

It is not a de Polignac number, because 6666743943 - 2² = 6666743939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6666743943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666743903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2160880 + ... + 2163962.

It is an arithmetic number, because the mean of its divisors is an integer number (405670902).

Almost surely, 2^6666743943 is an apocalyptic number.

6666743943 is a deficient number, since it is larger than the sum of its proper divisors (3069357705).

6666743943 is a wasteful number, since it uses less digits than its factorization.

6666743943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5663 (or 5660 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 54.

The square root of 6666743943 is about 81650.1313103659. The cubic root of 6666743943 is about 1882.0793297153.

The spelling of 6666743943 in words is "six billion, six hundred sixty-six million, seven hundred forty-three thousand, nine hundred forty-three".