243940709375999 has 2 divisors, whose sum is σ = 243940709376000. Its totient is φ = 243940709375998.

The previous prime is 243940709375983. The next prime is 243940709376059. The reversal of 243940709375999 is 999573907049342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243940709375999 - 2⁴ = 243940709375983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243940709375599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121970354687999 + 121970354688000.

It is an arithmetic number, because the mean of its divisors is an integer number (121970354688000).

Almost surely, 2^{243940709375999} is an apocalyptic number.

243940709375999 is a deficient number, since it is larger than the sum of its proper divisors (1).

243940709375999 is an equidigital number, since it uses as much as digits as its factorization.

243940709375999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4166497440, while the sum is 80.

The spelling of 243940709375999 in words is "two hundred forty-three trillion, nine hundred forty billion, seven hundred nine million, three hundred seventy-five thousand, nine hundred ninety-nine".