2165181224 has 8 divisors (see below), whose sum is σ = 4059714810. Its totient is φ = 1082590608.

The previous prime is 2165181197. The next prime is 2165181247. The reversal of 2165181224 is 4221815612.

It can be written as a sum of positive squares in only one way, i.e., 2114344324 + 50836900 = 45982^2 + 7130^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135323819 + ... + 135323834.

Almost surely, 2^2165181224 is an apocalyptic number.

It is an amenable number.

2165181224 is a deficient number, since it is larger than the sum of its proper divisors (1894533586).

2165181224 is a wasteful number, since it uses less digits than its factorization.

2165181224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270647659 (or 270647655 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 2165181224 is about 46531.5078629524. The cubic root of 2165181224 is about 1293.6935635833.

Adding to 2165181224 its reverse (4221815612), we get a palindrome (6386996836).

The spelling of 2165181224 in words is "two billion, one hundred sixty-five million, one hundred eighty-one thousand, two hundred twenty-four".