2165225611 has 4 divisors (see below), whose sum is σ = 2173458672. Its totient is φ = 2156992552.

The previous prime is 2165225609. The next prime is 2165225633. The reversal of 2165225611 is 1165225612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2165225611 - 2¹ = 2165225609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165205611) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4116136 + ... + 4116661.

It is an arithmetic number, because the mean of its divisors is an integer number (543364668).

Almost surely, 2^2165225611 is an apocalyptic number.

2165225611 is a deficient number, since it is larger than the sum of its proper divisors (8233061).

2165225611 is an equidigital number, since it uses as much as digits as its factorization.

2165225611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8233060.

The product of its digits is 7200, while the sum is 31.

The square root of 2165225611 is about 46531.9848168977. The cubic root of 2165225611 is about 1293.7024039185.

Subtracting from 2165225611 its reverse (1165225612), we obtain a palindrome (999999999).

The spelling of 2165225611 in words is "two billion, one hundred sixty-five million, two hundred twenty-five thousand, six hundred eleven".