6668543 has 4 divisors (see below), whose sum is σ = 7621200. Its totient is φ = 5715888.

The previous prime is 6668537. The next prime is 6668549. The reversal of 6668543 is 3458666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3458666 = 2 ⋅1729333.

It is an interprime number because it is at equal distance from previous prime (6668537) and next prime (6668549).

It is a cyclic number.

It is not a de Polignac number, because 6668543 - 2¹² = 6664447 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6668497 and 6668506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6668549) 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, 476318 + ... + 476331.

It is an arithmetic number, because the mean of its divisors is an integer number (1905300).

Almost surely, 2^6668543 is an apocalyptic number.

6668543 is a deficient number, since it is larger than the sum of its proper divisors (952657).

6668543 is an equidigital number, since it uses as much as digits as its factorization.

6668543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952656.

The product of its digits is 103680, while the sum is 38.

The square root of 6668543 is about 2582.3522222966. The cubic root of 6668543 is about 188.2248610926.

The spelling of 6668543 in words is "six million, six hundred sixty-eight thousand, five hundred forty-three".