2165143265 has 8 divisors (see below), whose sum is σ = 2598423720. Its totient is φ = 1731946752.

The previous prime is 2165143213. The next prime is 2165143361. The reversal of 2165143265 is 5623415612.

It can be written as a sum of positive squares in 4 ways, for example, as 699708304 + 1465434961 = 26452^2 + 38281^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2165143265 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79607 + ... + 103283.

It is an arithmetic number, because the mean of its divisors is an integer number (324802965).

Almost surely, 2^2165143265 is an apocalyptic number.

It is an amenable number.

2165143265 is a deficient number, since it is larger than the sum of its proper divisors (433280455).

2165143265 is a wasteful number, since it uses less digits than its factorization.

2165143265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41971.

The product of its digits is 43200, while the sum is 35.

The square root of 2165143265 is about 46531.0999762524. The cubic root of 2165143265 is about 1293.6860033845.

Adding to 2165143265 its reverse (5623415612), we get a palindrome (7788558877).

The spelling of 2165143265 in words is "two billion, one hundred sixty-five million, one hundred forty-three thousand, two hundred sixty-five".