265373716721 has 2 divisors, whose sum is σ = 265373716722. Its totient is φ = 265373716720.

The previous prime is 265373716691. The next prime is 265373716747. The reversal of 265373716721 is 127617373562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265075671025 + 298045696 = 514855^2 + 17264^2 .

It is a cyclic number.

It is not a de Polignac number, because 265373716721 - 2³⁴ = 248193847537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 265373716721.

It is not a weakly prime, because it can be changed into another prime (265373736721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132686858360 + 132686858361.

It is an arithmetic number, because the mean of its divisors is an integer number (132686858361).

Almost surely, 2^265373716721 is an apocalyptic number.

It is an amenable number.

265373716721 is a deficient number, since it is larger than the sum of its proper divisors (1).

265373716721 is an equidigital number, since it uses as much as digits as its factorization.

265373716721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2222640, while the sum is 50.

The spelling of 265373716721 in words is "two hundred sixty-five billion, three hundred seventy-three million, seven hundred sixteen thousand, seven hundred twenty-one".