2064065681 has 2 divisors, whose sum is σ = 2064065682. Its totient is φ = 2064065680.

The previous prime is 2064065671. The next prime is 2064065711. The reversal of 2064065681 is 1865604602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1172446081 + 891619600 = 34241^2 + 29860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2064065681 is a prime.

It is a super-2 number, since 2×2064065681² = 8520734270963987522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2064065671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1032032840 + 1032032841.

It is an arithmetic number, because the mean of its divisors is an integer number (1032032841).

Almost surely, 2^2064065681 is an apocalyptic number.

It is an amenable number.

2064065681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2064065681 is an equidigital number, since it uses as much as digits as its factorization.

2064065681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 2064065681 is about 45431.9896218513. The cubic root of 2064065681 is about 1273.2328574828.

The spelling of 2064065681 in words is "two billion, sixty-four million, sixty-five thousand, six hundred eighty-one".