169906998612809 has 2 divisors, whose sum is σ = 169906998612810. Its totient is φ = 169906998612808.

The previous prime is 169906998612803. The next prime is 169906998612811. The reversal of 169906998612809 is 908216899609961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144797228381584 + 25109770231225 = 12033172^2 + 5010965^2 .

It is a cyclic number.

It is not a de Polignac number, because 169906998612809 - 2¹² = 169906998608713 is a prime.

It is a super-2 number, since 2×169906998612809² (a number of 29 digits) contains 22 as substring.

Together with 169906998612811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (169906998612803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84953499306404 + 84953499306405.

It is an arithmetic number, because the mean of its divisors is an integer number (84953499306405).

Almost surely, 2^{169906998612809} is an apocalyptic number.

It is an amenable number.

169906998612809 is a deficient number, since it is larger than the sum of its proper divisors (1).

169906998612809 is an equidigital number, since it uses as much as digits as its factorization.

169906998612809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632586752, while the sum is 83.

The spelling of 169906998612809 in words is "one hundred sixty-nine trillion, nine hundred six billion, nine hundred ninety-eight million, six hundred twelve thousand, eight hundred nine".