242765684509 has 2 divisors, whose sum is σ = 242765684510. Its totient is φ = 242765684508.

The previous prime is 242765684429. The next prime is 242765684531. The reversal of 242765684509 is 905486567242.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232560240025 + 10205444484 = 482245^2 + 101022^2 .

It is a cyclic number.

It is not a de Polignac number, because 242765684509 - 2¹⁹ = 242765160221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242765684599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121382842254 + 121382842255.

It is an arithmetic number, because the mean of its divisors is an integer number (121382842255).

Almost surely, 2^242765684509 is an apocalyptic number.

It is an amenable number.

242765684509 is a deficient number, since it is larger than the sum of its proper divisors (1).

242765684509 is an equidigital number, since it uses as much as digits as its factorization.

242765684509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29030400, while the sum is 58.

The spelling of 242765684509 in words is "two hundred forty-two billion, seven hundred sixty-five million, six hundred eighty-four thousand, five hundred nine".