2165511225 has 24 divisors (see below), whose sum is σ = 3768751840. Its totient is φ = 1094152320.

The previous prime is 2165511217. The next prime is 2165511241. The reversal of 2165511225 is 5221155612.

It is not a de Polignac number, because 2165511225 - 2³ = 2165511217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2165511192 and 2165511201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 758404 + ... + 761253.

Almost surely, 2^2165511225 is an apocalyptic number.

2165511225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2165511225 is a deficient number, since it is larger than the sum of its proper divisors (1603240615).

2165511225 is a wasteful number, since it uses less digits than its factorization.

2165511225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519689 (or 1519684 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The square root of 2165511225 is about 46535.0537229732. The cubic root of 2165511225 is about 1293.7592853309.

Adding to 2165511225 its reverse (5221155612), we get a palindrome (7386666837).

The spelling of 2165511225 in words is "two billion, one hundred sixty-five million, five hundred eleven thousand, two hundred twenty-five".