2165610015 has 24 divisors (see below), whose sum is σ = 3801245760. Its totient is φ = 1140369984.

The previous prime is 2165609993. The next prime is 2165610019. The reversal of 2165610015 is 5100165612.

It is a happy number.

2165610015 is a `hidden beast` number, since 2 + 1 + 656 + 1 + 0 + 0 + 1 + 5 = 666.

It is not a de Polignac number, because 2165610015 - 2⁶ = 2165609951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165610019) 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 23 ways as a sum of consecutive naturals, for example, 301032 + ... + 308141.

It is an arithmetic number, because the mean of its divisors is an integer number (158385240).

Almost surely, 2^2165610015 is an apocalyptic number.

2165610015 is a deficient number, since it is larger than the sum of its proper divisors (1635635745).

2165610015 is a wasteful number, since it uses less digits than its factorization.

2165610015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609263 (or 609260 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 2165610015 is about 46536.1151687590. The cubic root of 2165610015 is about 1293.7789586741.

Adding to 2165610015 its reverse (5100165612), we get a palindrome (7265775627).

The spelling of 2165610015 in words is "two billion, one hundred sixty-five million, six hundred ten thousand, fifteen".