99991166606101 has 2 divisors, whose sum is σ = 99991166606102. Its totient is φ = 99991166606100.

The previous prime is 99991166606059. The next prime is 99991166606183. The reversal of 99991166606101 is 10160666119999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50048691740100 + 49942474866001 = 7074510^2 + 7066999^2 .

It is an emirp because it is prime and its reverse (10160666119999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99991166606101 - 2³¹ = 99989019122453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99991166601101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995583303050 + 49995583303051.

It is an arithmetic number, because the mean of its divisors is an integer number (49995583303051).

Almost surely, 2^{99991166606101} is an apocalyptic number.

It is an amenable number.

99991166606101 is a deficient number, since it is larger than the sum of its proper divisors (1).

99991166606101 is an equidigital number, since it uses as much as digits as its factorization.

99991166606101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8503056, while the sum is 64.

The spelling of 99991166606101 in words is "ninety-nine trillion, nine hundred ninety-one billion, one hundred sixty-six million, six hundred six thousand, one hundred one".