16706656607657 has 2 divisors, whose sum is σ = 16706656607658. Its totient is φ = 16706656607656.

The previous prime is 16706656607651. The next prime is 16706656607671. The reversal of 16706656607657 is 75670665660761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9994095886336 + 6712560721321 = 3161344^2 + 2590861^2 .

It is a cyclic number.

It is not a de Polignac number, because 16706656607657 - 2³² = 16702361640361 is a prime.

It is a super-2 number, since 2×16706656607657² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16706656607651) 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, 8353328303828 + 8353328303829.

It is an arithmetic number, because the mean of its divisors is an integer number (8353328303829).

Almost surely, 2^{16706656607657} is an apocalyptic number.

It is an amenable number.

16706656607657 is a deficient number, since it is larger than the sum of its proper divisors (1).

16706656607657 is an equidigital number, since it uses as much as digits as its factorization.

16706656607657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400075200, while the sum is 68.

The spelling of 16706656607657 in words is "sixteen trillion, seven hundred six billion, six hundred fifty-six million, six hundred seven thousand, six hundred fifty-seven".