161982209559 has 16 divisors (see below), whose sum is σ = 221284080864. Its totient is φ = 105335193600.

The previous prime is 161982209551. The next prime is 161982209629. The reversal of 161982209559 is 955902289161.

It is not a de Polignac number, because 161982209559 - 2³ = 161982209551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161982209499 and 161982209508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161982209551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 578839 + ... + 811799.

It is an arithmetic number, because the mean of its divisors is an integer number (13830255054).

Almost surely, 2^161982209559 is an apocalyptic number.

161982209559 is a deficient number, since it is larger than the sum of its proper divisors (59301871305).

161982209559 is a wasteful number, since it uses less digits than its factorization.

161982209559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238658.

The product of its (nonzero) digits is 3499200, while the sum is 57.

The spelling of 161982209559 in words is "one hundred sixty-one billion, nine hundred eighty-two million, two hundred nine thousand, five hundred fifty-nine".