6543115543 has 4 divisors (see below), whose sum is σ = 6549855048. Its totient is φ = 6536376040.

The previous prime is 6543115493. The next prime is 6543115561. The reversal of 6543115543 is 3455113456.

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 6543115543 - 2²⁹ = 6006244631 is a prime.

It is a super-2 number, since 2×6543115543² = 85624722018096369698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543115573) 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, 3368296 + ... + 3370237.

It is an arithmetic number, because the mean of its divisors is an integer number (1637463762).

Almost surely, 2^6543115543 is an apocalyptic number.

6543115543 is a deficient number, since it is larger than the sum of its proper divisors (6739505).

6543115543 is an equidigital number, since it uses as much as digits as its factorization.

6543115543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6739504.

The product of its digits is 108000, while the sum is 37.

The square root of 6543115543 is about 80889.5267819017. The cubic root of 6543115543 is about 1870.3728791158.

Adding to 6543115543 its reverse (3455113456), we get a palindrome (9998228999).

The spelling of 6543115543 in words is "six billion, five hundred forty-three million, one hundred fifteen thousand, five hundred forty-three".