166878 has 24 divisors (see below), whose sum is σ = 369408. Its totient is φ = 54432.

The previous prime is 166871. The next prime is 166909. The reversal of 166878 is 878661.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166871) by changing a digit.

166878 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1251 + ... + 1377.

It is an arithmetic number, because the mean of its divisors is an integer number (15392).

2¹⁶⁶⁸⁷⁸ is an apocalyptic number.

166878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166878 is an abundant number, since it is smaller than the sum of its proper divisors (202530).

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

166878 is a wasteful number, since it uses less digits than its factorization.

166878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 205 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 166878 is about 408.5070378831. The cubic root of 166878 is about 55.0553712336.

The spelling of 166878 in words is "one hundred sixty-six thousand, eight hundred seventy-eight".