489728168161 has 2 divisors, whose sum is σ = 489728168162. Its totient is φ = 489728168160.

The previous prime is 489728168131. The next prime is 489728168179. The reversal of 489728168161 is 161861827984.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 266339598561 + 223388569600 = 516081^2 + 472640^2 .

It is a cyclic number.

It is not a de Polignac number, because 489728168161 - 2²⁵ = 489694613729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 489728168161.

It is not a weakly prime, because it can be changed into another prime (489728168131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244864084080 + 244864084081.

It is an arithmetic number, because the mean of its divisors is an integer number (244864084081).

Almost surely, 2^489728168161 is an apocalyptic number.

It is an amenable number.

489728168161 is a deficient number, since it is larger than the sum of its proper divisors (1).

489728168161 is an equidigital number, since it uses as much as digits as its factorization.

489728168161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9289728, while the sum is 61.

The spelling of 489728168161 in words is "four hundred eighty-nine billion, seven hundred twenty-eight million, one hundred sixty-eight thousand, one hundred sixty-one".