16678889 has 2 divisors, whose sum is σ = 16678890. Its totient is φ = 16678888.

The previous prime is 16678877. The next prime is 16678901. The reversal of 16678889 is 98887661.

It is a balanced prime because it is at equal distance from previous prime (16678877) and next prime (16678901).

It can be written as a sum of positive squares in only one way, i.e., 10942864 + 5736025 = 3308^2 + 2395^2 .

It is a cyclic number.

It is not a de Polignac number, because 16678889 - 2⁴ = 16678873 is a prime.

It is a Chen prime.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 16678889.

It is not a weakly prime, because it can be changed into another prime (16648889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8339444 + 8339445.

It is an arithmetic number, because the mean of its divisors is an integer number (8339445).

Almost surely, 2^16678889 is an apocalyptic number.

It is an amenable number.

16678889 is a deficient number, since it is larger than the sum of its proper divisors (1).

16678889 is an equidigital number, since it uses as much as digits as its factorization.

16678889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 53.

The square root of 16678889 is about 4083.9795543073. The cubic root of 16678889 is about 255.4989028028.

The spelling of 16678889 in words is "sixteen million, six hundred seventy-eight thousand, eight hundred eighty-nine".