2165140065 has 16 divisors (see below), whose sum is σ = 3779153856. Its totient is φ = 1049764800.

The previous prime is 2165140049. The next prime is 2165140067. The reversal of 2165140065 is 5600415612.

It is not a de Polignac number, because 2165140065 - 2⁴ = 2165140049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2165140067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6560866 + ... + 6561195.

It is an arithmetic number, because the mean of its divisors is an integer number (236197116).

Almost surely, 2^2165140065 is an apocalyptic number.

It is an amenable number.

2165140065 is a deficient number, since it is larger than the sum of its proper divisors (1614013791).

2165140065 is a wasteful number, since it uses less digits than its factorization.

2165140065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13122080.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 2165140065 is about 46531.0655906353. The cubic root of 2165140065 is about 1293.6853660445.

Adding to 2165140065 its reverse (5600415612), we get a palindrome (7765555677).

It can be divided in two parts, 21651 and 40065, that added together give a palindrome (61716).

The spelling of 2165140065 in words is "two billion, one hundred sixty-five million, one hundred forty thousand, sixty-five".