99661566828017 has 2 divisors, whose sum is σ = 99661566828018. Its totient is φ = 99661566828016.

The previous prime is 99661566827971. The next prime is 99661566828121. The reversal of 99661566828017 is 71082866516699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51951933957361 + 47709632870656 = 7207769^2 + 6907216^2 .

It is a cyclic number.

It is not a de Polignac number, because 99661566828017 - 2⁴⁴ = 82069380783601 is a prime.

It is a super-3 number, since 3×99661566828017³ (a number of 43 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (99661566828217) 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, 49830783414008 + 49830783414009.

It is an arithmetic number, because the mean of its divisors is an integer number (49830783414009).

Almost surely, 2^{99661566828017} is an apocalyptic number.

It is an amenable number.

99661566828017 is a deficient number, since it is larger than the sum of its proper divisors (1).

99661566828017 is an equidigital number, since it uses as much as digits as its factorization.

99661566828017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 470292480, while the sum is 74.

The spelling of 99661566828017 in words is "ninety-nine trillion, six hundred sixty-one billion, five hundred sixty-six million, eight hundred twenty-eight thousand, seventeen".