166660 has 24 divisors (see below), whose sum is σ = 377496. Its totient is φ = 61440.

The previous prime is 166657. The next prime is 166667. The reversal of 166660 is 66661.

166660 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in 4 ways, for example, as 20736 + 145924 = 144^2 + 382^2 .

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166667) 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, 61 + ... + 580.

It is an arithmetic number, because the mean of its divisors is an integer number (15729).

2¹⁶⁶⁶⁶⁰ is an apocalyptic number.

166660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166660 is an abundant number, since it is smaller than the sum of its proper divisors (210836).

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

166660 is a wasteful number, since it uses less digits than its factorization.

166660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 166660 is about 408.2401254164. The cubic root of 166660 is about 55.0313870435.

Subtracting from 166660 its reverse (66661), we obtain a palindrome (99999).

The spelling of 166660 in words is "one hundred sixty-six thousand, six hundred sixty".