161655432 has 16 divisors (see below), whose sum is σ = 404138640. Its totient is φ = 53885136.

The previous prime is 161655407. The next prime is 161655433. The reversal of 161655432 is 234556161.

161655432 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161655432² = 52264957390213248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161655393 and 161655402.

It is not an unprimeable number, because it can be changed into a prime (161655433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3367798 + ... + 3367845.

It is an arithmetic number, because the mean of its divisors is an integer number (25258665).

Almost surely, 2^161655432 is an apocalyptic number.

161655432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161655432 is an abundant number, since it is smaller than the sum of its proper divisors (242483208).

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

161655432 is a wasteful number, since it uses less digits than its factorization.

161655432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6735652 (or 6735648 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 161655432 is about 12714.3789466887. The cubic root of 161655432 is about 544.7494086853.

The spelling of 161655432 in words is "one hundred sixty-one million, six hundred fifty-five thousand, four hundred thirty-two".