211561366543 has 2 divisors, whose sum is σ = 211561366544. Its totient is φ = 211561366542.

The previous prime is 211561366529. The next prime is 211561366553. The reversal of 211561366543 is 345663165112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211561366543 - 2⁹ = 211561366031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211561366543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211561366553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105780683271 + 105780683272.

It is an arithmetic number, because the mean of its divisors is an integer number (105780683272).

Almost surely, 2^211561366543 is an apocalyptic number.

211561366543 is a deficient number, since it is larger than the sum of its proper divisors (1).

211561366543 is an equidigital number, since it uses as much as digits as its factorization.

211561366543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 43.

The spelling of 211561366543 in words is "two hundred eleven billion, five hundred sixty-one million, three hundred sixty-six thousand, five hundred forty-three".