16678771 has 2 divisors, whose sum is σ = 16678772. Its totient is φ = 16678770.

The previous prime is 16678763. The next prime is 16678801. The reversal of 16678771 is 17787661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16678771 - 2³ = 16678763 is a prime.

It is not a weakly prime, because it can be changed into another prime (16678721) 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, 8339385 + 8339386.

It is an arithmetic number, because the mean of its divisors is an integer number (8339386).

Almost surely, 2^16678771 is an apocalyptic number.

16678771 is a deficient number, since it is larger than the sum of its proper divisors (1).

16678771 is an equidigital number, since it uses as much as digits as its factorization.

16678771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 43.

The square root of 16678771 is about 4083.9651075885. The cubic root of 16678771 is about 255.4983002658.

The spelling of 16678771 in words is "sixteen million, six hundred seventy-eight thousand, seven hundred seventy-one".