6656143 has 4 divisors (see below), whose sum is σ = 7168168. Its totient is φ = 6144120.

The previous prime is 6656123. The next prime is 6656171. The reversal of 6656143 is 3416566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3416566 = 2 ⋅1708283.

It is a cyclic number.

It is not a de Polignac number, because 6656143 - 2⁹ = 6655631 is a prime.

It is an Ulam number.

It is a Duffinian number.

6656143 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255993 + ... + 256018.

It is an arithmetic number, because the mean of its divisors is an integer number (1792042).

Almost surely, 2^6656143 is an apocalyptic number.

6656143 is a deficient number, since it is larger than the sum of its proper divisors (512025).

6656143 is a wasteful number, since it uses less digits than its factorization.

6656143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512024.

The product of its digits is 12960, while the sum is 31.

The square root of 6656143 is about 2579.9501933177. The cubic root of 6656143 is about 188.1081221268.

The spelling of 6656143 in words is "six million, six hundred fifty-six thousand, one hundred forty-three".