242665738661 has 2 divisors, whose sum is σ = 242665738662. Its totient is φ = 242665738660.

The previous prime is 242665738619. The next prime is 242665738751. The reversal of 242665738661 is 166837566242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215000069761 + 27665668900 = 463681^2 + 166330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242665738661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 242665738597 and 242665738606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242665738261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121332869330 + 121332869331.

It is an arithmetic number, because the mean of its divisors is an integer number (121332869331).

Almost surely, 2^242665738661 is an apocalyptic number.

It is an amenable number.

242665738661 is a deficient number, since it is larger than the sum of its proper divisors (1).

242665738661 is an equidigital number, since it uses as much as digits as its factorization.

242665738661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 56.

The spelling of 242665738661 in words is "two hundred forty-two billion, six hundred sixty-five million, seven hundred thirty-eight thousand, six hundred sixty-one".