243723661967 has 2 divisors, whose sum is σ = 243723661968. Its totient is φ = 243723661966.

The previous prime is 243723661921. The next prime is 243723661969. The reversal of 243723661967 is 769166327342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243723661967 - 2¹⁸ = 243723399823 is a prime.

Together with 243723661969, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243723661969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121861830983 + 121861830984.

It is an arithmetic number, because the mean of its divisors is an integer number (121861830984).

Almost surely, 2^243723661967 is an apocalyptic number.

243723661967 is a deficient number, since it is larger than the sum of its proper divisors (1).

243723661967 is an equidigital number, since it uses as much as digits as its factorization.

243723661967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13716864, while the sum is 56.

The spelling of 243723661967 in words is "two hundred forty-three billion, seven hundred twenty-three million, six hundred sixty-one thousand, nine hundred sixty-seven".