543643555043521 has 2 divisors, whose sum is σ = 543643555043522. Its totient is φ = 543643555043520.

The previous prime is 543643555043483. The next prime is 543643555043599. The reversal of 543643555043521 is 125340555346345.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521712925553296 + 21930629490225 = 22841036^2 + 4683015^2 .

It is a cyclic number.

It is not a de Polignac number, because 543643555043521 - 2¹⁵ = 543643555010753 is a prime.

It is not a weakly prime, because it can be changed into another prime (543643555043021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271821777521760 + 271821777521761.

It is an arithmetic number, because the mean of its divisors is an integer number (271821777521761).

Almost surely, 2^{543643555043521} is an apocalyptic number.

It is an amenable number.

543643555043521 is a deficient number, since it is larger than the sum of its proper divisors (1).

543643555043521 is an equidigital number, since it uses as much as digits as its factorization.

543643555043521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800000, while the sum is 55.

The spelling of 543643555043521 in words is "five hundred forty-three trillion, six hundred forty-three billion, five hundred fifty-five million, forty-three thousand, five hundred twenty-one".