6666143 has 8 divisors (see below), whose sum is σ = 7523280. Its totient is φ = 5850880.

The previous prime is 6666137. The next prime is 6666157. The reversal of 6666143 is 3416666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10130 + ... + 10767.

It is an arithmetic number, because the mean of its divisors is an integer number (940410).

Almost surely, 2^6666143 is an apocalyptic number.

6666143 is a deficient number, since it is larger than the sum of its proper divisors (857137).

6666143 is a wasteful number, since it uses less digits than its factorization.

6666143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20937.

The product of its digits is 15552, while the sum is 32.

The square root of 6666143 is about 2581.8874878662. The cubic root of 6666143 is about 188.2022777552.

The spelling of 6666143 in words is "six million, six hundred sixty-six thousand, one hundred forty-three".