2115665273 has 2 divisors, whose sum is σ = 2115665274. Its totient is φ = 2115665272.

The previous prime is 2115665239. The next prime is 2115665297. The reversal of 2115665273 is 3725665112.

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., 2114896144 + 769129 = 45988^2 + 877^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115665273 - 2¹⁰ = 2115664249 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2115665873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057832636 + 1057832637.

It is an arithmetic number, because the mean of its divisors is an integer number (1057832637).

Almost surely, 2^2115665273 is an apocalyptic number.

It is an amenable number.

2115665273 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115665273 is an equidigital number, since it uses as much as digits as its factorization.

2115665273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 2115665273 is about 45996.3615191463. The cubic root of 2115665273 is about 1283.7555056466.

The spelling of 2115665273 in words is "two billion, one hundred fifteen million, six hundred sixty-five thousand, two hundred seventy-three".