16765768081 has 2 divisors, whose sum is σ = 16765768082. Its totient is φ = 16765768080.

The previous prime is 16765768073. The next prime is 16765768133. The reversal of 16765768081 is 18086756761.

16765768081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14926730625 + 1839037456 = 122175^2 + 42884^2 .

It is an emirp because it is prime and its reverse (18086756761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16765768081 - 2³ = 16765768073 is a prime.

It is a super-2 number, since 2×16765768081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16765768021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8382884040 + 8382884041.

It is an arithmetic number, because the mean of its divisors is an integer number (8382884041).

Almost surely, 2^16765768081 is an apocalyptic number.

It is an amenable number.

16765768081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16765768081 is an equidigital number, since it uses as much as digits as its factorization.

16765768081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 16765768081 in words is "sixteen billion, seven hundred sixty-five million, seven hundred sixty-eight thousand, eighty-one".