181660 has 24 divisors (see below), whose sum is σ = 395136. Its totient is φ = 70080.

The previous prime is 181639. The next prime is 181667. The reversal of 181660 is 66181.

181660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474 + ... + 766.

It is an arithmetic number, because the mean of its divisors is an integer number (16464).

2¹⁸¹⁶⁶⁰ is an apocalyptic number.

181660 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 181660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197568).

181660 is an abundant number, since it is smaller than the sum of its proper divisors (213476).

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

181660 is a wasteful number, since it uses less digits than its factorization.

181660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 181660 is about 426.2159077275. The cubic root of 181660 is about 56.6351997539.

It can be divided in two parts, 181 and 660, that added together give a square (841 = 29²).

The spelling of 181660 in words is "one hundred eighty-one thousand, six hundred sixty".