161985119433 has 8 divisors (see below), whose sum is σ = 216431059200. Its totient is φ = 107764629648.

The previous prime is 161985119407. The next prime is 161985119449. The reversal of 161985119433 is 334911589161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161985119433 - 2⁹ = 161985118921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161985111433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56360818 + ... + 56363691.

It is an arithmetic number, because the mean of its divisors is an integer number (27053882400).

Almost surely, 2^161985119433 is an apocalyptic number.

It is an amenable number.

161985119433 is a deficient number, since it is larger than the sum of its proper divisors (54445939767).

161985119433 is a wasteful number, since it uses less digits than its factorization.

161985119433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112724991.

The product of its digits is 699840, while the sum is 51.

The spelling of 161985119433 in words is "one hundred sixty-one billion, nine hundred eighty-five million, one hundred nineteen thousand, four hundred thirty-three".