166012003 has 4 divisors (see below), whose sum is σ = 166038160. Its totient is φ = 165985848.

The previous prime is 166011991. The next prime is 166012019. The reversal of 166012003 is 300210661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 300210661 = 277 ⋅1083793.

It is a cyclic number.

It is not a de Polignac number, because 166012003 - 2⁹ = 166011491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166012073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3178 + ... + 18496.

It is an arithmetic number, because the mean of its divisors is an integer number (41509540).

Almost surely, 2^166012003 is an apocalyptic number.

166012003 is a deficient number, since it is larger than the sum of its proper divisors (26157).

166012003 is a wasteful number, since it uses less digits than its factorization.

166012003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26156.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 166012003 is about 12884.5645250431. The cubic root of 166012003 is about 549.5997120484.

Adding to 166012003 its reverse (300210661), we get a palindrome (466222664).

The spelling of 166012003 in words is "one hundred sixty-six million, twelve thousand, three".