163866 has 16 divisors (see below), whose sum is σ = 338688. Its totient is φ = 52800.

The previous prime is 163861. The next prime is 163871. The reversal of 163866 is 668361.

It is an interprime number because it is at equal distance from previous prime (163861) and next prime (163871).

It is not an unprimeable number, because it can be changed into a prime (163861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255 + ... + 626.

It is an arithmetic number, because the mean of its divisors is an integer number (21168).

2¹⁶³⁸⁶⁶ is an apocalyptic number.

163866 is an abundant number, since it is smaller than the sum of its proper divisors (174822).

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

163866 is a wasteful number, since it uses less digits than its factorization.

163866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917.

The product of its digits is 5184, while the sum is 30.

The square root of 163866 is about 404.8036561100. The cubic root of 163866 is about 54.7221246311.

The spelling of 163866 in words is "one hundred sixty-three thousand, eight hundred sixty-six".