169801220161 has 2 divisors, whose sum is σ = 169801220162. Its totient is φ = 169801220160.

The previous prime is 169801220117. The next prime is 169801220167. The reversal of 169801220161 is 161022108961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167142786561 + 2658433600 = 408831^2 + 51560^2 .

It is a cyclic number.

It is not a de Polignac number, because 169801220161 - 2²³ = 169792831553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 169801220161.

It is not a weakly prime, because it can be changed into another prime (169801220167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84900610080 + 84900610081.

It is an arithmetic number, because the mean of its divisors is an integer number (84900610081).

Almost surely, 2^169801220161 is an apocalyptic number.

It is an amenable number.

169801220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

169801220161 is an equidigital number, since it uses as much as digits as its factorization.

169801220161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 169801220161 in words is "one hundred sixty-nine billion, eight hundred one million, two hundred twenty thousand, one hundred sixty-one".