161658880 has 48 divisors (see below), whose sum is σ = 387911160. Its totient is φ = 64659456.

The previous prime is 161658853. The next prime is 161658901. The reversal of 161658880 is 88856161.

It is a happy number.

161658880 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 2×161658880² = 52267186965708800, which contains 22 as substring.

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, 2347 + ... + 18133.

Almost surely, 2^161658880 is an apocalyptic number.

161658880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161658880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193955580).

161658880 is an abundant number, since it is smaller than the sum of its proper divisors (226252280).

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

161658880 is an equidigital number, since it uses as much as digits as its factorization.

161658880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15814 (or 15794 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 161658880 is about 12714.5145404770. The cubic root of 161658880 is about 544.7532817021.

The spelling of 161658880 in words is "one hundred sixty-one million, six hundred fifty-eight thousand, eight hundred eighty".