166003203 has 8 divisors (see below), whose sum is σ = 221794048. Its totient is φ = 110440584.

The previous prime is 166003193. The next prime is 166003217. The reversal of 166003203 is 302300661.

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

It is not a de Polignac number, because 166003203 - 2⁶ = 166003139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166003203.

It is not an unprimeable number, because it can be changed into a prime (166003223) 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, 55351 + ... + 58272.

It is an arithmetic number, because the mean of its divisors is an integer number (27724256).

Almost surely, 2^166003203 is an apocalyptic number.

166003203 is a deficient number, since it is larger than the sum of its proper divisors (55790845).

166003203 is a wasteful number, since it uses less digits than its factorization.

166003203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114113.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 166003203 is about 12884.2230266322. The cubic root of 166003203 is about 549.5900007768.

Adding to 166003203 its reverse (302300661), we get a palindrome (468303864).

The spelling of 166003203 in words is "one hundred sixty-six million, three thousand, two hundred three".