161959985 has 8 divisors (see below), whose sum is σ = 212020416. Its totient is φ = 117789040.

The previous prime is 161959949. The next prime is 161960011. The reversal of 161959985 is 589959161.

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

It is not a de Polignac number, because 161959985 - 2⁶ = 161959921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1472309 + ... + 1472418.

It is an arithmetic number, because the mean of its divisors is an integer number (26502552).

Almost surely, 2^161959985 is an apocalyptic number.

It is an amenable number.

161959985 is a deficient number, since it is larger than the sum of its proper divisors (50060431).

161959985 is a wasteful number, since it uses less digits than its factorization.

161959985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944743.

The product of its digits is 874800, while the sum is 53.

The square root of 161959985 is about 12726.3500266180. The cubic root of 161959985 is about 545.0912901533.

The spelling of 161959985 in words is "one hundred sixty-one million, nine hundred fifty-nine thousand, nine hundred eighty-five".