166003 has 4 divisors (see below), whose sum is σ = 174760. Its totient is φ = 157248.

The previous prime is 165983. The next prime is 166013. The reversal of 166003 is 300661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4350 + ... + 4387.

It is an arithmetic number, because the mean of its divisors is an integer number (43690).

2¹⁶⁶⁰⁰³ is an apocalyptic number.

166003 is a deficient number, since it is larger than the sum of its proper divisors (8757).

166003 is an equidigital number, since it uses as much as digits as its factorization.

166003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8756.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 166003 is about 407.4346573378. The cubic root of 166003 is about 54.9589776751.

Adding to 166003 its reverse (300661), we get a palindrome (466664).

The spelling of 166003 in words is "one hundred sixty-six thousand, three".