99689454494209 has 4 divisors (see below), whose sum is σ = 99809707154260. Its totient is φ = 99569201834160.

The previous prime is 99689454494171. The next prime is 99689454494213. The reversal of 99689454494209 is 90249445498699.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68929430640625 + 30760023853584 = 8302375^2 + 5546172^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99689454494209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99689454494309) 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 in 3 ways as a sum of consecutive naturals, for example, 60126328782 + ... + 60126330439.

It is an arithmetic number, because the mean of its divisors is an integer number (24952426788565).

Almost surely, 2^{99689454494209} is an apocalyptic number.

It is an amenable number.

99689454494209 is a deficient number, since it is larger than the sum of its proper divisors (120252660051).

99689454494209 is a wasteful number, since it uses less digits than its factorization.

99689454494209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120252660050.

The product of its (nonzero) digits is 7255941120, while the sum is 82.

The spelling of 99689454494209 in words is "ninety-nine trillion, six hundred eighty-nine billion, four hundred fifty-four million, four hundred ninety-four thousand, two hundred nine".