2165652409 has 2 divisors, whose sum is σ = 2165652410. Its totient is φ = 2165652408.

The previous prime is 2165652371. The next prime is 2165652427. The reversal of 2165652409 is 9042565612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2133978025 + 31674384 = 46195^2 + 5628^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165652409 - 2⁹ = 2165651897 is a prime.

It is not a weakly prime, because it can be changed into another prime (2165658409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082826204 + 1082826205.

It is an arithmetic number, because the mean of its divisors is an integer number (1082826205).

Almost surely, 2^2165652409 is an apocalyptic number.

It is an amenable number.

2165652409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165652409 is an equidigital number, since it uses as much as digits as its factorization.

2165652409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 2165652409 is about 46536.5706622222. The cubic root of 2165652409 is about 1293.7874009616.

The spelling of 2165652409 in words is "two billion, one hundred sixty-five million, six hundred fifty-two thousand, four hundred nine".