243733569493 has 2 divisors, whose sum is σ = 243733569494. Its totient is φ = 243733569492.

The previous prime is 243733569461. The next prime is 243733569511. The reversal of 243733569493 is 394965337342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150356266564 + 93377302929 = 387758^2 + 305577^2 .

It is a cyclic number.

It is not a de Polignac number, because 243733569493 - 2⁵ = 243733569461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243734569493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121866784746 + 121866784747.

It is an arithmetic number, because the mean of its divisors is an integer number (121866784747).

Almost surely, 2^243733569493 is an apocalyptic number.

It is an amenable number.

243733569493 is a deficient number, since it is larger than the sum of its proper divisors (1).

243733569493 is an equidigital number, since it uses as much as digits as its factorization.

243733569493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44089920, while the sum is 58.

The spelling of 243733569493 in words is "two hundred forty-three billion, seven hundred thirty-three million, five hundred sixty-nine thousand, four hundred ninety-three".