161688485889 has 12 divisors (see below), whose sum is σ = 266914326016. Its totient is φ = 92393420472.

The previous prime is 161688485867. The next prime is 161688485971. The reversal of 161688485889 is 988584886161.

161688485889 is a `hidden beast` number, since 1 + 6 + 1 + 68 + 8 + 485 + 8 + 89 = 666.

It is not a de Polignac number, because 161688485889 - 2⁸ = 161688485633 is a prime.

It is a super-2 number, since 2×161688485889² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161688485839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1283241889 + ... + 1283242014.

Almost surely, 2^161688485889 is an apocalyptic number.

It is an amenable number.

161688485889 is a deficient number, since it is larger than the sum of its proper divisors (105225840127).

161688485889 is a wasteful number, since it uses less digits than its factorization.

161688485889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566483916 (or 2566483913 counting only the distinct ones).

The product of its digits is 212336640, while the sum is 72.

The spelling of 161688485889 in words is "one hundred sixty-one billion, six hundred eighty-eight million, four hundred eighty-five thousand, eight hundred eighty-nine".