161985716 has 24 divisors (see below), whose sum is σ = 298932480. Its totient is φ = 76591872.

The previous prime is 161985713. The next prime is 161985721. The reversal of 161985716 is 617589161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161985713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49565 + ... + 52731.

It is an arithmetic number, because the mean of its divisors is an integer number (12455520).

Almost surely, 2^161985716 is an apocalyptic number.

It is an amenable number.

161985716 is a deficient number, since it is larger than the sum of its proper divisors (136946764).

161985716 is a wasteful number, since it uses less digits than its factorization.

161985716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3863 (or 3861 counting only the distinct ones).

The product of its digits is 90720, while the sum is 44.

The square root of 161985716 is about 12727.3609204737. The cubic root of 161985716 is about 545.1201553105.

The spelling of 161985716 in words is "one hundred sixty-one million, nine hundred eighty-five thousand, seven hundred sixteen".