6666442043 has 4 divisors (see below), whose sum is σ = 6673527408. Its totient is φ = 6659356680.

The previous prime is 6666442039. The next prime is 6666442147. The reversal of 6666442043 is 3402446666.

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

It is a cyclic number.

It is not a de Polignac number, because 6666442043 - 2² = 6666442039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666445043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3541271 + ... + 3543152.

It is an arithmetic number, because the mean of its divisors is an integer number (1668381852).

Almost surely, 2^6666442043 is an apocalyptic number.

6666442043 is a deficient number, since it is larger than the sum of its proper divisors (7085365).

6666442043 is an equidigital number, since it uses as much as digits as its factorization.

6666442043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7085364.

The product of its (nonzero) digits is 497664, while the sum is 41.

The square root of 6666442043 is about 81648.2825477670. The cubic root of 6666442043 is about 1882.0509196283.

The spelling of 6666442043 in words is "six billion, six hundred sixty-six million, four hundred forty-two thousand, forty-three".