166540 has 24 divisors (see below), whose sum is σ = 382032. Its totient is φ = 60480.

The previous prime is 166487. The next prime is 166541. The reversal of 166540 is 45661.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (166541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159 + ... + 598.

It is an arithmetic number, because the mean of its divisors is an integer number (15918).

2¹⁶⁶⁵⁴⁰ is an apocalyptic number.

166540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166540 is an abundant number, since it is smaller than the sum of its proper divisors (215492).

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

166540 is a wasteful number, since it uses less digits than its factorization.

166540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777 (or 775 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 166540 is about 408.0931266268. The cubic root of 166540 is about 55.0181758110.

It can be divided in two parts, 16 and 6540, that added together give a palindrome (6556).

The spelling of 166540 in words is "one hundred sixty-six thousand, five hundred forty".