2165660213 has 4 divisors (see below), whose sum is σ = 2216024448. Its totient is φ = 2115295980.

The previous prime is 2165660201. The next prime is 2165660239. The reversal of 2165660213 is 3120665612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2165660213 - 2⁶ = 2165660149 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 2165660213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165660813) 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 3 ways as a sum of consecutive naturals, for example, 25182053 + ... + 25182138.

It is an arithmetic number, because the mean of its divisors is an integer number (554006112).

Almost surely, 2^2165660213 is an apocalyptic number.

It is an amenable number.

2165660213 is a deficient number, since it is larger than the sum of its proper divisors (50364235).

2165660213 is an equidigital number, since it uses as much as digits as its factorization.

2165660213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50364234.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2165660213 is about 46536.6545101815. The cubic root of 2165660213 is about 1293.7889550283.

The spelling of 2165660213 in words is "two billion, one hundred sixty-five million, six hundred sixty thousand, two hundred thirteen".