243723634369 has 2 divisors, whose sum is σ = 243723634370. Its totient is φ = 243723634368.

The previous prime is 243723634321. The next prime is 243723634381. The reversal of 243723634369 is 963436327342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230270418225 + 13453216144 = 479865^2 + 115988^2 .

It is a cyclic number.

It is not a de Polignac number, because 243723634369 - 2²⁷ = 243589416641 is a prime.

It is a super-2 number, since 2×243723634369² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243723634169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121861817184 + 121861817185.

It is an arithmetic number, because the mean of its divisors is an integer number (121861817185).

Almost surely, 2^243723634369 is an apocalyptic number.

It is an amenable number.

243723634369 is a deficient number, since it is larger than the sum of its proper divisors (1).

243723634369 is an equidigital number, since it uses as much as digits as its factorization.

243723634369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 52.

The spelling of 243723634369 in words is "two hundred forty-three billion, seven hundred twenty-three million, six hundred thirty-four thousand, three hundred sixty-nine".