6541565543 has 4 divisors (see below), whose sum is σ = 6541863600. Its totient is φ = 6541267488.

The previous prime is 6541565483. The next prime is 6541565549. The reversal of 6541565543 is 3455651456.

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 6541565543 - 2⁸ = 6541565287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6541565494 and 6541565503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6541565549) 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, 113243 + ... + 160956.

It is an arithmetic number, because the mean of its divisors is an integer number (1635465900).

Almost surely, 2^6541565543 is an apocalyptic number.

6541565543 is a deficient number, since it is larger than the sum of its proper divisors (298057).

6541565543 is a wasteful number, since it uses less digits than its factorization.

6541565543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298056.

The product of its digits is 1080000, while the sum is 44.

The square root of 6541565543 is about 80879.9452460250. The cubic root of 6541565543 is about 1870.2251764455.

The spelling of 6541565543 in words is "six billion, five hundred forty-one million, five hundred sixty-five thousand, five hundred forty-three".