242668718557 has 2 divisors, whose sum is σ = 242668718558. Its totient is φ = 242668718556.

The previous prime is 242668718531. The next prime is 242668718569. The reversal of 242668718557 is 755817866242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215821568356 + 26847150201 = 464566^2 + 163851^2 .

It is a cyclic number.

It is not a de Polignac number, because 242668718557 - 2¹⁵ = 242668685789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 242668718495 and 242668718504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242668718507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121334359278 + 121334359279.

It is an arithmetic number, because the mean of its divisors is an integer number (121334359279).

Almost surely, 2^242668718557 is an apocalyptic number.

It is an amenable number.

242668718557 is a deficient number, since it is larger than the sum of its proper divisors (1).

242668718557 is an equidigital number, since it uses as much as digits as its factorization.

242668718557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45158400, while the sum is 61.

The spelling of 242668718557 in words is "two hundred forty-two billion, six hundred sixty-eight million, seven hundred eighteen thousand, five hundred fifty-seven".