6543668 has 12 divisors (see below), whose sum is σ = 11535972. Its totient is φ = 3247680.

The previous prime is 6543659. The next prime is 6543671. The reversal of 6543668 is 8663456.

It can be written as a sum of positive squares in 2 ways, for example, as 2748964 + 3794704 = 1658^2 + 1948^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5423 + ... + 6518.

It is an arithmetic number, because the mean of its divisors is an integer number (961331).

Almost surely, 2^6543668 is an apocalyptic number.

It is an amenable number.

6543668 is a deficient number, since it is larger than the sum of its proper divisors (4992304).

6543668 is a wasteful number, since it uses less digits than its factorization.

6543668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12082 (or 12080 counting only the distinct ones).

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

The square root of 6543668 is about 2558.0594207328. The cubic root of 6543668 is about 187.0425518235.

The spelling of 6543668 in words is "six million, five hundred forty-three thousand, six hundred sixty-eight".