2165841569 has 2 divisors, whose sum is σ = 2165841570. Its totient is φ = 2165841568.

The previous prime is 2165841553. The next prime is 2165841589. The reversal of 2165841569 is 9651485612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1476096400 + 689745169 = 38420^2 + 26263^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165841569 - 2⁴ = 2165841553 is a prime.

It is a super-2 number, since 2×2165841569² = 9381739404016763522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2165841589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082920784 + 1082920785.

It is an arithmetic number, because the mean of its divisors is an integer number (1082920785).

Almost surely, 2^2165841569 is an apocalyptic number.

It is an amenable number.

2165841569 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165841569 is an equidigital number, since it uses as much as digits as its factorization.

2165841569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 47.

The square root of 2165841569 is about 46538.6029979414. The cubic root of 2165841569 is about 1293.8250687022.

The spelling of 2165841569 in words is "two billion, one hundred sixty-five million, eight hundred forty-one thousand, five hundred sixty-nine".