6543663 has 8 divisors (see below), whose sum is σ = 9971328. Its totient is φ = 3739224.

The previous prime is 6543659. The next prime is 6543671. The reversal of 6543663 is 3663456.

It is a happy number.

6543663 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 6543663 - 2² = 6543659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543613) 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, 155781 + ... + 155822.

It is an arithmetic number, because the mean of its divisors is an integer number (1246416).

Almost surely, 2^6543663 is an apocalyptic number.

6543663 is a deficient number, since it is larger than the sum of its proper divisors (3427665).

6543663 is a wasteful number, since it uses less digits than its factorization.

6543663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311613.

The product of its digits is 38880, while the sum is 33.

The square root of 6543663 is about 2558.0584434293. The cubic root of 6543663 is about 187.0425041839.

The spelling of 6543663 in words is "six million, five hundred forty-three thousand, six hundred sixty-three".