2165720170 has 16 divisors (see below), whose sum is σ = 3898837800. Its totient is φ = 866167744.

The previous prime is 2165720147. The next prime is 2165720173. The reversal of 2165720170 is 710275612.

It can be written as a sum of positive squares in 4 ways, for example, as 1860973321 + 304746849 = 43139^2 + 17457^2 .

It is not an unprimeable number, because it can be changed into a prime (2165720173) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 110256 + ... + 128404.

Almost surely, 2^2165720170 is an apocalyptic number.

2165720170 is a deficient number, since it is larger than the sum of its proper divisors (1733117630).

2165720170 is a wasteful number, since it uses less digits than its factorization.

2165720170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30089.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 2165720170 is about 46537.2986968518. The cubic root of 2165720170 is about 1293.8008945726.

Adding to 2165720170 its reverse (710275612), we get a palindrome (2875995782).

The spelling of 2165720170 in words is "two billion, one hundred sixty-five million, seven hundred twenty thousand, one hundred seventy".