16605166609 has 2 divisors, whose sum is σ = 16605166610. Its totient is φ = 16605166608.

The previous prime is 16605166547. The next prime is 16605166631. The reversal of 16605166609 is 90666150661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16564462209 + 40704400 = 128703^2 + 6380^2 .

It is an emirp because it is prime and its reverse (90666150661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16605166609 is a prime.

It is a super-2 number, since 2×16605166609² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16605166639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8302583304 + 8302583305.

It is an arithmetic number, because the mean of its divisors is an integer number (8302583305).

Almost surely, 2^16605166609 is an apocalyptic number.

It is an amenable number.

16605166609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16605166609 is an equidigital number, since it uses as much as digits as its factorization.

16605166609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 16605166609 in words is "sixteen billion, six hundred five million, one hundred sixty-six thousand, six hundred nine".