2065808042009 has 2 divisors, whose sum is σ = 2065808042010. Its totient is φ = 2065808042008.

The previous prime is 2065808041987. The next prime is 2065808042033. The reversal of 2065808042009 is 9002408085602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1563512664025 + 502295377984 = 1250405^2 + 708728^2 .

It is a cyclic number.

It is not a de Polignac number, because 2065808042009 - 2⁸ = 2065808041753 is a prime.

It is not a weakly prime, because it can be changed into another prime (2065808032009) 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 as a sum of consecutive naturals, namely, 1032904021004 + 1032904021005.

It is an arithmetic number, because the mean of its divisors is an integer number (1032904021005).

Almost surely, 2^{2065808042009} is an apocalyptic number.

It is an amenable number.

2065808042009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2065808042009 is an equidigital number, since it uses as much as digits as its factorization.

2065808042009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 2065808042009 in words is "two trillion, sixty-five billion, eight hundred eight million, forty-two thousand, nine".