543639541613261 has 2 divisors, whose sum is σ = 543639541613262. Its totient is φ = 543639541613260.

The previous prime is 543639541613257. The next prime is 543639541613323. The reversal of 543639541613261 is 162316145936345.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497920442285161 + 45719099328100 = 22314131^2 + 6761590^2 .

It is a cyclic number.

It is not a de Polignac number, because 543639541613261 - 2² = 543639541613257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 543639541613261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (543639541613461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271819770806630 + 271819770806631.

It is an arithmetic number, because the mean of its divisors is an integer number (271819770806631).

Almost surely, 2^{543639541613261} is an apocalyptic number.

It is an amenable number.

543639541613261 is a deficient number, since it is larger than the sum of its proper divisors (1).

543639541613261 is an equidigital number, since it uses as much as digits as its factorization.

543639541613261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41990400, while the sum is 59.

The spelling of 543639541613261 in words is "five hundred forty-three trillion, six hundred thirty-nine billion, five hundred forty-one million, six hundred thirteen thousand, two hundred sixty-one".