161965646 has 8 divisors (see below), whose sum is σ = 245307504. Its totient is φ = 80196480.

The previous prime is 161965603. The next prime is 161965651. The reversal of 161965646 is 646569161.

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

It is a junction number, because it is equal to n+sod(n) for n = 161965597 and 161965606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392915 + ... + 393326.

It is an arithmetic number, because the mean of its divisors is an integer number (30663438).

Almost surely, 2^161965646 is an apocalyptic number.

161965646 is a deficient number, since it is larger than the sum of its proper divisors (83341858).

161965646 is a wasteful number, since it uses less digits than its factorization.

161965646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786346.

The product of its digits is 233280, while the sum is 44.

The square root of 161965646 is about 12726.5724372276. The cubic root of 161965646 is about 545.0976409521.

The spelling of 161965646 in words is "one hundred sixty-one million, nine hundred sixty-five thousand, six hundred forty-six".