16677779 has 2 divisors, whose sum is σ = 16677780. Its totient is φ = 16677778.

The previous prime is 16677757. The next prime is 16677781. The reversal of 16677779 is 97777661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16677779 is a prime.

It is a Sophie Germain prime.

Together with 16677781, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (16677179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8338889 + 8338890.

It is an arithmetic number, because the mean of its divisors is an integer number (8338890).

Almost surely, 2^16677779 is an apocalyptic number.

16677779 is a deficient number, since it is larger than the sum of its proper divisors (1).

16677779 is an equidigital number, since it uses as much as digits as its factorization.

16677779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777924, while the sum is 50.

The square root of 16677779 is about 4083.8436551856. The cubic root of 16677779 is about 255.4932347579.

The spelling of 16677779 in words is "sixteen million, six hundred seventy-seven thousand, seven hundred seventy-nine".