16656081779 has 2 divisors, whose sum is σ = 16656081780. Its totient is φ = 16656081778.

The previous prime is 16656081737. The next prime is 16656081803. The reversal of 16656081779 is 97718065661.

It is a strong prime.

It is an emirp because it is prime and its reverse (97718065661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16656081779 - 2²⁰ = 16655033203 is a prime.

It is not a weakly prime, because it can be changed into another prime (16656081179) 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, 8328040889 + 8328040890.

It is an arithmetic number, because the mean of its divisors is an integer number (8328040890).

Almost surely, 2^16656081779 is an apocalyptic number.

16656081779 is a deficient number, since it is larger than the sum of its proper divisors (1).

16656081779 is an equidigital number, since it uses as much as digits as its factorization.

16656081779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 56.

The spelling of 16656081779 in words is "sixteen billion, six hundred fifty-six million, eighty-one thousand, seven hundred seventy-nine".