6543733850821 has 8 divisors (see below), whose sum is σ = 6828270079104. Its totient is φ = 6259199794320.

The previous prime is 6543733850809. The next prime is 6543733850851. The reversal of 6543733850821 is 1280583373456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6543733850821 - 2²⁵ = 6543700296389 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 (6543733850851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9834831 + ... + 10479091.

It is an arithmetic number, because the mean of its divisors is an integer number (853533759888).

Almost surely, 2^{6543733850821} is an apocalyptic number.

It is an amenable number.

6543733850821 is a deficient number, since it is larger than the sum of its proper divisors (284536228283).

6543733850821 is a wasteful number, since it uses less digits than its factorization.

6543733850821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085891.

The product of its (nonzero) digits is 14515200, while the sum is 55.

The spelling of 6543733850821 in words is "six trillion, five hundred forty-three billion, seven hundred thirty-three million, eight hundred fifty thousand, eight hundred twenty-one".