243042999977 has 2 divisors, whose sum is σ = 243042999978. Its totient is φ = 243042999976.

The previous prime is 243042999911. The next prime is 243043000001. The reversal of 243042999977 is 779999240342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241345230361 + 1697769616 = 491269^2 + 41204^2 .

It is a cyclic number.

It is not a de Polignac number, because 243042999977 - 2⁸ = 243042999721 is a prime.

It is not a weakly prime, because it can be changed into another prime (243042999077) 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, 121521499988 + 121521499989.

It is an arithmetic number, because the mean of its divisors is an integer number (121521499989).

Almost surely, 2^243042999977 is an apocalyptic number.

It is an amenable number.

243042999977 is a deficient number, since it is larger than the sum of its proper divisors (1).

243042999977 is an equidigital number, since it uses as much as digits as its factorization.

243042999977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61725888, while the sum is 65.

The spelling of 243042999977 in words is "two hundred forty-three billion, forty-two million, nine hundred ninety-nine thousand, nine hundred seventy-seven".