16331987667209 has 2 divisors, whose sum is σ = 16331987667210. Its totient is φ = 16331987667208.

The previous prime is 16331987667179. The next prime is 16331987667217. The reversal of 16331987667209 is 90276678913361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16307640745984 + 24346921225 = 4038272^2 + 156035^2 .

It is a cyclic number.

It is not a de Polignac number, because 16331987667209 - 2¹² = 16331987663113 is a prime.

It is not a weakly prime, because it can be changed into another prime (16331987667299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8165993833604 + 8165993833605.

It is an arithmetic number, because the mean of its divisors is an integer number (8165993833605).

Almost surely, 2^{16331987667209} is an apocalyptic number.

It is an amenable number.

16331987667209 is a deficient number, since it is larger than the sum of its proper divisors (1).

16331987667209 is an equidigital number, since it uses as much as digits as its factorization.

16331987667209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 123451776, while the sum is 68.

The spelling of 16331987667209 in words is "sixteen trillion, three hundred thirty-one billion, nine hundred eighty-seven million, six hundred sixty-seven thousand, two hundred nine".