16683350001781 has 2 divisors, whose sum is σ = 16683350001782. Its totient is φ = 16683350001780.

The previous prime is 16683350001779. The next prime is 16683350001863. The reversal of 16683350001781 is 18710005338661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10802889900625 + 5880460101156 = 3286775^2 + 2424966^2 .

It is a cyclic number.

It is not a de Polignac number, because 16683350001781 - 2¹ = 16683350001779 is a prime.

It is a super-2 number, since 2×16683350001781² (a number of 27 digits) contains 22 as substring.

Together with 16683350001779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16683350001181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8341675000890 + 8341675000891.

It is an arithmetic number, because the mean of its divisors is an integer number (8341675000891).

Almost surely, 2^{16683350001781} is an apocalyptic number.

It is an amenable number.

16683350001781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16683350001781 is an equidigital number, since it uses as much as digits as its factorization.

16683350001781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 16683350001781 in words is "sixteen trillion, six hundred eighty-three billion, three hundred fifty million, one thousand, seven hundred eighty-one".