2165833849 has 4 divisors (see below), whose sum is σ = 2166062500. Its totient is φ = 2165605200.

The previous prime is 2165833793. The next prime is 2165833867. The reversal of 2165833849 is 9483385612.

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 1794115449 + 371718400 = 42357^2 + 19280^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165833849 - 2¹³ = 2165825657 is a prime.

It is a super-2 number, since 2×2165833849² = 9381672522948309602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165833889) 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, 99474 + ... + 119275.

It is an arithmetic number, because the mean of its divisors is an integer number (541515625).

Almost surely, 2^2165833849 is an apocalyptic number.

It is an amenable number.

2165833849 is a deficient number, since it is larger than the sum of its proper divisors (228651).

2165833849 is an equidigital number, since it uses as much as digits as its factorization.

2165833849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228650.

The product of its digits is 1244160, while the sum is 49.

The square root of 2165833849 is about 46538.5200559708. The cubic root of 2165833849 is about 1293.8235314489.

The spelling of 2165833849 in words is "two billion, one hundred sixty-five million, eight hundred thirty-three thousand, eight hundred forty-nine".