16545720173009 has 2 divisors, whose sum is σ = 16545720173010. Its totient is φ = 16545720173008.

The previous prime is 16545720172973. The next prime is 16545720173033. The reversal of 16545720173009 is 90037102754561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16453245187600 + 92474985409 = 4056260^2 + 304097^2 .

It is a cyclic number.

It is not a de Polignac number, because 16545720173009 - 2³² = 16541425205713 is a prime.

It is a super-2 number, since 2×16545720173009² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16545720173509) 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, 8272860086504 + 8272860086505.

It is an arithmetic number, because the mean of its divisors is an integer number (8272860086505).

Almost surely, 2^{16545720173009} is an apocalyptic number.

It is an amenable number.

16545720173009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16545720173009 is an equidigital number, since it uses as much as digits as its factorization.

16545720173009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 16545720173009 in words is "sixteen trillion, five hundred forty-five billion, seven hundred twenty million, one hundred seventy-three thousand, nine".