16659887128019 has 2 divisors, whose sum is σ = 16659887128020. Its totient is φ = 16659887128018.

The previous prime is 16659887128009. The next prime is 16659887128039. The reversal of 16659887128019 is 91082178895661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16659887128019 - 2²⁴ = 16659870350803 is a prime.

It is a super-2 number, since 2×16659887128019² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16659887128009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8329943564009 + 8329943564010.

It is an arithmetic number, because the mean of its divisors is an integer number (8329943564010).

Almost surely, 2^{16659887128019} is an apocalyptic number.

16659887128019 is a deficient number, since it is larger than the sum of its proper divisors (1).

16659887128019 is an equidigital number, since it uses as much as digits as its factorization.

16659887128019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104509440, while the sum is 71.

The spelling of 16659887128019 in words is "sixteen trillion, six hundred fifty-nine billion, eight hundred eighty-seven million, one hundred twenty-eight thousand, nineteen".