16605768989 has 2 divisors, whose sum is σ = 16605768990. Its totient is φ = 16605768988.

The previous prime is 16605768973. The next prime is 16605769001. The reversal of 16605768989 is 98986750661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12787764889 + 3818004100 = 113083^2 + 61790^2 .

It is a cyclic number.

It is not a de Polignac number, because 16605768989 - 2⁴ = 16605768973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16605761989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8302884494 + 8302884495.

It is an arithmetic number, because the mean of its divisors is an integer number (8302884495).

Almost surely, 2^16605768989 is an apocalyptic number.

It is an amenable number.

16605768989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16605768989 is an equidigital number, since it uses as much as digits as its factorization.

16605768989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39191040, while the sum is 65.

The spelling of 16605768989 in words is "sixteen billion, six hundred five million, seven hundred sixty-eight thousand, nine hundred eighty-nine".