99689454494171 has 2 divisors, whose sum is σ = 99689454494172. Its totient is φ = 99689454494170.

The previous prime is 99689454494137. The next prime is 99689454494213. The reversal of 99689454494171 is 17149445498699.

It is a weak prime.

It is an emirp because it is prime and its reverse (17149445498699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99689454494171 - 2¹⁰ = 99689454493147 is a prime.

It is not a weakly prime, because it can be changed into another prime (99689454394171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49844727247085 + 49844727247086.

It is an arithmetic number, because the mean of its divisors is an integer number (49844727247086).

Almost surely, 2^{99689454494171} is an apocalyptic number.

99689454494171 is a deficient number, since it is larger than the sum of its proper divisors (1).

99689454494171 is an equidigital number, since it uses as much as digits as its factorization.

99689454494171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2821754880, while the sum is 80.

The spelling of 99689454494171 in words is "ninety-nine trillion, six hundred eighty-nine billion, four hundred fifty-four million, four hundred ninety-four thousand, one hundred seventy-one".