16661061712073 has 2 divisors, whose sum is σ = 16661061712074. Its totient is φ = 16661061712072.

The previous prime is 16661061712027. The next prime is 16661061712079. The reversal of 16661061712073 is 37021716016661.

16661061712073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10396187873344 + 6264873838729 = 3224312^2 + 2502973^2 .

It is a cyclic number.

It is not a de Polignac number, because 16661061712073 - 2¹² = 16661061707977 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16661061712079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330530856036 + 8330530856037.

It is an arithmetic number, because the mean of its divisors is an integer number (8330530856037).

Almost surely, 2^{16661061712073} is an apocalyptic number.

It is an amenable number.

16661061712073 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661061712073 is an equidigital number, since it uses as much as digits as its factorization.

16661061712073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 16661061712073 in words is "sixteen trillion, six hundred sixty-one billion, sixty-one million, seven hundred twelve thousand, seventy-three".