161884909489 has 2 divisors, whose sum is σ = 161884909490. Its totient is φ = 161884909488.

The previous prime is 161884909481. The next prime is 161884909517. The reversal of 161884909489 is 984909488161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139272268864 + 22612640625 = 373192^2 + 150375^2 .

It is a cyclic number.

It is not a de Polignac number, because 161884909489 - 2³ = 161884909481 is a prime.

It is a super-2 number, since 2×161884909489² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161884909481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80942454744 + 80942454745.

It is an arithmetic number, because the mean of its divisors is an integer number (80942454745).

Almost surely, 2^161884909489 is an apocalyptic number.

It is an amenable number.

161884909489 is a deficient number, since it is larger than the sum of its proper divisors (1).

161884909489 is an equidigital number, since it uses as much as digits as its factorization.

161884909489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35831808, while the sum is 67.

The spelling of 161884909489 in words is "one hundred sixty-one billion, eight hundred eighty-four million, nine hundred nine thousand, four hundred eighty-nine".