2166511165 has 16 divisors (see below), whose sum is σ = 3199771008. Its totient is φ = 1371329856.

The previous prime is 2166511153. The next prime is 2166511189. The reversal of 2166511165 is 5611156612.

It is not a de Polignac number, because 2166511165 - 2¹¹ = 2166509117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2166511165.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2380327 + ... + 2381236.

It is an arithmetic number, because the mean of its divisors is an integer number (199985688).

Almost surely, 2^2166511165 is an apocalyptic number.

It is an amenable number.

2166511165 is a deficient number, since it is larger than the sum of its proper divisors (1033259843).

2166511165 is a wasteful number, since it uses less digits than its factorization.

2166511165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4761588.

The product of its digits is 10800, while the sum is 34.

The square root of 2166511165 is about 46545.7964267451. The cubic root of 2166511165 is about 1293.9583888303.

Adding to 2166511165 its reverse (5611156612), we get a palindrome (7777667777).

The spelling of 2166511165 in words is "two billion, one hundred sixty-six million, five hundred eleven thousand, one hundred sixty-five".