2065440161 has 2 divisors, whose sum is σ = 2065440162. Its totient is φ = 2065440160.

The previous prime is 2065440137. The next prime is 2065440217. The reversal of 2065440161 is 1610445602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1341830161 + 723610000 = 36631^2 + 26900^2 .

It is a cyclic number.

It is not a de Polignac number, because 2065440161 - 2¹⁴ = 2065423777 is a prime.

It is not a weakly prime, because it can be changed into another prime (2065440101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1032720080 + 1032720081.

It is an arithmetic number, because the mean of its divisors is an integer number (1032720081).

Almost surely, 2^2065440161 is an apocalyptic number.

It is an amenable number.

2065440161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2065440161 is an equidigital number, since it uses as much as digits as its factorization.

2065440161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 2065440161 is about 45447.1138907632. The cubic root of 2065440161 is about 1273.5154138639.

Adding to 2065440161 its reverse (1610445602), we get a palindrome (3675885763).

The spelling of 2065440161 in words is "two billion, sixty-five million, four hundred forty thousand, one hundred sixty-one".