16866939802369 has 2 divisors, whose sum is σ = 16866939802370. Its totient is φ = 16866939802368.

The previous prime is 16866939802343. The next prime is 16866939802381. The reversal of 16866939802369 is 96320893966861.

16866939802369 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., 13815070560769 + 3051869241600 = 3716863^2 + 1746960^2 .

It is a cyclic number.

It is not a de Polignac number, because 16866939802369 - 2²¹ = 16866937705217 is a prime.

It is a super-2 number, since 2×16866939802369² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16866939802295 and 16866939802304.

It is not a weakly prime, because it can be changed into another prime (16866939802319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8433469901184 + 8433469901185.

It is an arithmetic number, because the mean of its divisors is an integer number (8433469901185).

Almost surely, 2^{16866939802369} is an apocalyptic number.

It is an amenable number.

16866939802369 is a deficient number, since it is larger than the sum of its proper divisors (1).

16866939802369 is an equidigital number, since it uses as much as digits as its factorization.

16866939802369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088391168, while the sum is 76.

The spelling of 16866939802369 in words is "sixteen trillion, eight hundred sixty-six billion, nine hundred thirty-nine million, eight hundred two thousand, three hundred sixty-nine".