166663 has 8 divisors (see below), whose sum is σ = 197280. Its totient is φ = 137760.

The previous prime is 166657. The next prime is 166667. The reversal of 166663 is 366661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166663 - 2⁵ = 166631 is a prime.

It is a Duffinian number.

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, 208 + ... + 613.

It is an arithmetic number, because the mean of its divisors is an integer number (24660).

2¹⁶⁶⁶⁶³ is an apocalyptic number.

166663 is a deficient number, since it is larger than the sum of its proper divisors (30617).

166663 is an equidigital number, since it uses as much as digits as its factorization.

166663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857.

The product of its digits is 3888, while the sum is 28.

The square root of 166663 is about 408.2437997080. The cubic root of 166663 is about 55.0317172431.

The spelling of 166663 in words is "one hundred sixty-six thousand, six hundred sixty-three".