6646143 has 16 divisors (see below), whose sum is σ = 10661120. Its totient is φ = 3597696.

The previous prime is 6646049. The next prime is 6646153. The reversal of 6646143 is 3416466.

It is not a de Polignac number, because 6646143 - 2⁸ = 6645887 is a prime.

It is a Duffinian number.

6646143 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6646143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7930 + ... + 8727.

It is an arithmetic number, because the mean of its divisors is an integer number (666320).

Almost surely, 2^6646143 is an apocalyptic number.

6646143 is a deficient number, since it is larger than the sum of its proper divisors (4014977).

6646143 is a wasteful number, since it uses less digits than its factorization.

6646143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16686.

The product of its digits is 10368, while the sum is 30.

The square root of 6646143 is about 2578.0114429537. The cubic root of 6646143 is about 188.0138721467.

The spelling of 6646143 in words is "six million, six hundred forty-six thousand, one hundred forty-three".