6541565542 has 4 divisors (see below), whose sum is σ = 9812348316. Its totient is φ = 3270782770.

The previous prime is 6541565483. The next prime is 6541565549. The reversal of 6541565542 is 2455651456.

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

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1635391384 + ... + 1635391387.

It is an arithmetic number, because the mean of its divisors is an integer number (2453087079).

Almost surely, 2^6541565542 is an apocalyptic number.

6541565542 is a deficient number, since it is larger than the sum of its proper divisors (3270782774).

6541565542 is a wasteful number, since it uses less digits than its factorization.

6541565542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270782773.

The product of its digits is 720000, while the sum is 43.

The square root of 6541565542 is about 80879.9452398430. The cubic root of 6541565542 is about 1870.2251763502.

The spelling of 6541565542 in words is "six billion, five hundred forty-one million, five hundred sixty-five thousand, five hundred forty-two".