2660065221 has 16 divisors (see below), whose sum is σ = 3875466240. Its totient is φ = 1609543920.

The previous prime is 2660065147. The next prime is 2660065231. The reversal of 2660065221 is 1225600662.

It is not a de Polignac number, because 2660065221 - 2¹⁷ = 2659934149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660065231) by changing a digit.

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, 44685 + ... + 85538.

It is an arithmetic number, because the mean of its divisors is an integer number (242216640).

Almost surely, 2^2660065221 is an apocalyptic number.

It is an amenable number.

2660065221 is a deficient number, since it is larger than the sum of its proper divisors (1215401019).

2660065221 is a wasteful number, since it uses less digits than its factorization.

2660065221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130856.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 2660065221 is about 51575.8201195095. The cubic root of 2660065221 is about 1385.5773064539.

Adding to 2660065221 its reverse (1225600662), we get a palindrome (3885665883).

The spelling of 2660065221 in words is "two billion, six hundred sixty million, sixty-five thousand, two hundred twenty-one".