2185204665 has 64 divisors (see below), whose sum is σ = 4195676160. Its totient is φ = 950019840.

The previous prime is 2185204643. The next prime is 2185204673. The reversal of 2185204665 is 5664025812.

It is not a de Polignac number, because 2185204665 - 2¹⁰ = 2185203641 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 198660 + ... + 209370.

It is an arithmetic number, because the mean of its divisors is an integer number (65557440).

Almost surely, 2^2185204665 is an apocalyptic number.

It is an amenable number.

2185204665 is a deficient number, since it is larger than the sum of its proper divisors (2010471495).

2185204665 is a wasteful number, since it uses less digits than its factorization.

2185204665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10822.

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 2185204665 is about 46746.1727310376. The cubic root of 2185204665 is about 1297.6693279556.

The spelling of 2185204665 in words is "two billion, one hundred eighty-five million, two hundred four thousand, six hundred sixty-five".