2165112723017 has 4 divisors (see below), whose sum is σ = 2200606374276. Its totient is φ = 2129619071760.

The previous prime is 2165112723013. The next prime is 2165112723041. The reversal of 2165112723017 is 7103272115612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 338841574201 + 1826271148816 = 582101^2 + 1351396^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165112723017 - 2² = 2165112723013 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165112723013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17746825538 + ... + 17746825659.

It is an arithmetic number, because the mean of its divisors is an integer number (550151593569).

Almost surely, 2^{2165112723017} is an apocalyptic number.

It is an amenable number.

2165112723017 is a deficient number, since it is larger than the sum of its proper divisors (35493651259).

2165112723017 is an equidigital number, since it uses as much as digits as its factorization.

2165112723017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35493651258.

The product of its (nonzero) digits is 35280, while the sum is 38.

Adding to 2165112723017 its reverse (7103272115612), we get a palindrome (9268384838629).

The spelling of 2165112723017 in words is "two trillion, one hundred sixty-five billion, one hundred twelve million, seven hundred twenty-three thousand, seventeen".