543805386809 has 2 divisors, whose sum is σ = 543805386810. Its totient is φ = 543805386808.

The previous prime is 543805386791. The next prime is 543805386863. The reversal of 543805386809 is 908683508345.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 543412237225 + 393149584 = 737165^2 + 19828^2 .

It is a cyclic number.

It is not a de Polignac number, because 543805386809 - 2¹⁶ = 543805321273 is a prime.

It is a super-2 number, since 2×543805386809² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (543805386899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271902693404 + 271902693405.

It is an arithmetic number, because the mean of its divisors is an integer number (271902693405).

Almost surely, 2^543805386809 is an apocalyptic number.

It is an amenable number.

543805386809 is a deficient number, since it is larger than the sum of its proper divisors (1).

543805386809 is an equidigital number, since it uses as much as digits as its factorization.

543805386809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24883200, while the sum is 59.

The spelling of 543805386809 in words is "five hundred forty-three billion, eight hundred five million, three hundred eighty-six thousand, eight hundred nine".