243224355116681 has 2 divisors, whose sum is σ = 243224355116682. Its totient is φ = 243224355116680.

The previous prime is 243224355116621. The next prime is 243224355116707. The reversal of 243224355116681 is 186611553422342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149069839061056 + 94154516055625 = 12209416^2 + 9703325^2 .

It is a cyclic number.

It is not a de Polignac number, because 243224355116681 - 2¹⁰ = 243224355115657 is a prime.

It is a super-2 number, since 2×243224355116681² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243224355116621) 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 as a sum of consecutive naturals, namely, 121612177558340 + 121612177558341.

It is an arithmetic number, because the mean of its divisors is an integer number (121612177558341).

Almost surely, 2^{243224355116681} is an apocalyptic number.

It is an amenable number.

243224355116681 is a deficient number, since it is larger than the sum of its proper divisors (1).

243224355116681 is an equidigital number, since it uses as much as digits as its factorization.

243224355116681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8294400, while the sum is 53.

The spelling of 243224355116681 in words is "two hundred forty-three trillion, two hundred twenty-four billion, three hundred fifty-five million, one hundred sixteen thousand, six hundred eighty-one".