161816856 has 16 divisors (see below), whose sum is σ = 404542200. Its totient is φ = 53938944.

The previous prime is 161816801. The next prime is 161816861. The reversal of 161816856 is 658618161.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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, 3371161 + ... + 3371208.

Almost surely, 2^161816856 is an apocalyptic number.

It is an amenable number.

161816856 is an abundant number, since it is smaller than the sum of its proper divisors (242725344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161816856 is a wasteful number, since it uses less digits than its factorization.

161816856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6742378 (or 6742374 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The square root of 161816856 is about 12720.7254510110. The cubic root of 161816856 is about 544.9306715392.

The spelling of 161816856 in words is "one hundred sixty-one million, eight hundred sixteen thousand, eight hundred fifty-six".