2116511411165 has 16 divisors (see below), whose sum is σ = 2689346322288. Its totient is φ = 1593530474496.

The previous prime is 2116511411149. The next prime is 2116511411171. The reversal of 2116511411165 is 5611141156112.

It can be written as a sum of positive squares in 8 ways, for example, as 190616940409 + 1925894470756 = 436597^2 + 1387766^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116511411165 - 2⁴ = 2116511411149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1164089 + ... + 2363921.

It is an arithmetic number, because the mean of its divisors is an integer number (168084145143).

Almost surely, 2^{2116511411165} is an apocalyptic number.

It is an amenable number.

2116511411165 is a deficient number, since it is larger than the sum of its proper divisors (572834911123).

2116511411165 is a wasteful number, since it uses less digits than its factorization.

2116511411165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220608.

The product of its digits is 7200, while the sum is 35.

Adding to 2116511411165 its reverse (5611141156112), we get a palindrome (7727652567277).

The spelling of 2116511411165 in words is "two trillion, one hundred sixteen billion, five hundred eleven million, four hundred eleven thousand, one hundred sixty-five".