6666043 has 4 divisors (see below), whose sum is σ = 6689088. Its totient is φ = 6643000.

The previous prime is 6666029. The next prime is 6666047. The reversal of 6666043 is 3406666.

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 6666043 - 2¹³ = 6657851 is a prime.

It is a super-2 number, since 2×6666043² = 88872258555698, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6665996 and 6666014.

It is not an unprimeable number, because it can be changed into a prime (6666047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11083 + ... + 11668.

It is an arithmetic number, because the mean of its divisors is an integer number (1672272).

Almost surely, 2^6666043 is an apocalyptic number.

6666043 is a deficient number, since it is larger than the sum of its proper divisors (23045).

6666043 is a wasteful number, since it uses less digits than its factorization.

6666043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23044.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 6666043 is about 2581.8681221162. The cubic root of 6666043 is about 188.2013366651.

The spelling of 6666043 in words is "six million, six hundred sixty-six thousand, forty-three".