6543441145 has 4 divisors (see below), whose sum is σ = 7852129380. Its totient is φ = 5234752912.

The previous prime is 6543441139. The next prime is 6543441161. The reversal of 6543441145 is 5411443456.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2803384809 + 3740056336 = 52947^2 + 61156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6543441145 is a prime.

It is a super-3 number, since 3×6543441145³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 654344110 + ... + 654344119.

It is an arithmetic number, because the mean of its divisors is an integer number (1963032345).

Almost surely, 2^6543441145 is an apocalyptic number.

It is an amenable number.

6543441145 is a deficient number, since it is larger than the sum of its proper divisors (1308688235).

6543441145 is a wasteful number, since it uses less digits than its factorization.

6543441145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308688234.

The product of its digits is 115200, while the sum is 37.

The square root of 6543441145 is about 80891.5393907175. The cubic root of 6543441145 is about 1870.4039034316.

The spelling of 6543441145 in words is "six billion, five hundred forty-three million, four hundred forty-one thousand, one hundred forty-five".