161656396 has 24 divisors (see below), whose sum is σ = 312091920. Its totient is φ = 72652800.

The previous prime is 161656387. The next prime is 161656403. The reversal of 161656396 is 693656161.

It is a super-2 number, since 2×161656396² = 52265580735417632, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16725 + ... + 24556.

It is an arithmetic number, because the mean of its divisors is an integer number (13003830).

Almost surely, 2^161656396 is an apocalyptic number.

It is an amenable number.

161656396 is a deficient number, since it is larger than the sum of its proper divisors (150435524).

161656396 is a wasteful number, since it uses less digits than its factorization.

161656396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41385 (or 41383 counting only the distinct ones).

The product of its digits is 174960, while the sum is 43.

The square root of 161656396 is about 12714.4168564665. The cubic root of 161656396 is about 544.7504915181.

The spelling of 161656396 in words is "one hundred sixty-one million, six hundred fifty-six thousand, three hundred ninety-six".