2165210200465 has 16 divisors (see below), whose sum is σ = 2836448184528. Its totient is φ = 1577021377536.

The previous prime is 2165210200441. The next prime is 2165210200477. The reversal of 2165210200465 is 5640020125612.

It can be written as a sum of positive squares in 8 ways, for example, as 153113342209 + 2012096858256 = 391297^2 + 1418484^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165210200465 - 2⁷ = 2165210200337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2165210200465.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228152284 + ... + 228161773.

It is an arithmetic number, because the mean of its divisors is an integer number (177278011533).

Almost surely, 2^{2165210200465} is an apocalyptic number.

It is an amenable number.

2165210200465 is a deficient number, since it is larger than the sum of its proper divisors (671237984063).

2165210200465 is a wasteful number, since it uses less digits than its factorization.

2165210200465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456314148.

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 2165210200465 in words is "two trillion, one hundred sixty-five billion, two hundred ten million, two hundred thousand, four hundred sixty-five".