166518 has 36 divisors (see below), whose sum is σ = 407628. Its totient is φ = 48720.

The previous prime is 166487. The next prime is 166541. The reversal of 166518 is 815661.

166518 is a `hidden beast` number, since 1 + 6 + 651 + 8 = 666.

166518 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Its product of digits (1440) is a multiple of the sum of its prime divisors (45).

It is a junction number, because it is equal to n+sod(n) for n = 166491 and 166500.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 166518.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5728 + ... + 5756.

It is an arithmetic number, because the mean of its divisors is an integer number (11323).

2¹⁶⁶⁵¹⁸ is an apocalyptic number.

166518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203814).

166518 is an abundant number, since it is smaller than the sum of its proper divisors (241110).

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

166518 is a wasteful number, since it uses less digits than its factorization.

166518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 45 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 166518 is about 408.0661711046. The cubic root of 166518 is about 55.0157530633.

The spelling of 166518 in words is "one hundred sixty-six thousand, five hundred eighteen".