16682340781 has 2 divisors, whose sum is σ = 16682340782. Its totient is φ = 16682340780.

The previous prime is 16682340761. The next prime is 16682340797. The reversal of 16682340781 is 18704328661.

It is a happy number.

16682340781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12842555625 + 3839785156 = 113325^2 + 61966^2 .

It is an emirp because it is prime and its reverse (18704328661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16682340781 - 2²³ = 16673952173 is a prime.

It is a super-2 number, since 2×16682340781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16682340721) 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, 8341170390 + 8341170391.

It is an arithmetic number, because the mean of its divisors is an integer number (8341170391).

Almost surely, 2^16682340781 is an apocalyptic number.

It is an amenable number.

16682340781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16682340781 is an equidigital number, since it uses as much as digits as its factorization.

16682340781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 16682340781 in words is "sixteen billion, six hundred eighty-two million, three hundred forty thousand, seven hundred eighty-one".