6543660503 has 4 divisors (see below), whose sum is σ = 6650933688. Its totient is φ = 6436387320.

The previous prime is 6543660491. The next prime is 6543660551. The reversal of 6543660503 is 3050663456.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6543660503 - 2¹⁴ = 6543644119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543660583) 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, 53636501 + ... + 53636622.

It is an arithmetic number, because the mean of its divisors is an integer number (1662733422).

Almost surely, 2^6543660503 is an apocalyptic number.

6543660503 is a deficient number, since it is larger than the sum of its proper divisors (107273185).

6543660503 is a wasteful number, since it uses less digits than its factorization.

6543660503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107273184.

The product of its (nonzero) digits is 194400, while the sum is 38.

The square root of 6543660503 is about 80892.8952566293. The cubic root of 6543660503 is about 1870.4248039265.

The spelling of 6543660503 in words is "six billion, five hundred forty-three million, six hundred sixty thousand, five hundred three".