161656236 has 144 divisors (see below), whose sum is σ = 505849344. Its totient is φ = 44136576.

The previous prime is 161656207. The next prime is 161656267. The reversal of 161656236 is 632656161.

161656236 is a `hidden beast` number, since 1 + 61 + 6 + 562 + 36 = 666.

161656236 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161656236² = 52265477275375392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161656236.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 155976 + ... + 157008.

Almost surely, 2^161656236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161656236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252924672).

161656236 is an abundant number, since it is smaller than the sum of its proper divisors (344193108).

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

161656236 is a wasteful number, since it uses less digits than its factorization.

161656236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082 (or 1068 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 161656236 is about 12714.4105643950. The cubic root of 161656236 is about 544.7503117951.

The spelling of 161656236 in words is "one hundred sixty-one million, six hundred fifty-six thousand, two hundred thirty-six".