16978102847989 has 2 divisors, whose sum is σ = 16978102847990. Its totient is φ = 16978102847988.

The previous prime is 16978102847977. The next prime is 16978102848011. The reversal of 16978102847989 is 98974820187961.

16978102847989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14662964100625 + 2315138747364 = 3829225^2 + 1521558^2 .

It is a cyclic number.

It is not a de Polignac number, because 16978102847989 - 2⁹ = 16978102847477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16978102847389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8489051423994 + 8489051423995.

It is an arithmetic number, because the mean of its divisors is an integer number (8489051423995).

Almost surely, 2^{16978102847989} is an apocalyptic number.

It is an amenable number.

16978102847989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16978102847989 is an equidigital number, since it uses as much as digits as its factorization.

16978102847989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 877879296, while the sum is 79.

The spelling of 16978102847989 in words is "sixteen trillion, nine hundred seventy-eight billion, one hundred two million, eight hundred forty-seven thousand, nine hundred eighty-nine".