181668 has 12 divisors (see below), whose sum is σ = 423920. Its totient is φ = 60552.

The previous prime is 181667. The next prime is 181669. The reversal of 181668 is 866181.

It is an interprime number because it is at equal distance from previous prime (181667) and next prime (181669).

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 7558 + ... + 7581.

2¹⁸¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

181668 is an abundant number, since it is smaller than the sum of its proper divisors (242252).

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

181668 is a wasteful number, since it uses less digits than its factorization.

181668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15146 (or 15144 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 181668 is about 426.2252925391. The cubic root of 181668 is about 56.6360311145.

The spelling of 181668 in words is "one hundred eighty-one thousand, six hundred sixty-eight".