16500003 has 16 divisors (see below), whose sum is σ = 24245760. Its totient is φ = 9916704.

The previous prime is 16499963. The next prime is 16500007. The reversal of 16500003 is 30000561.

It is not a de Polignac number, because 16500003 - 2⁶ = 16499939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16500007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3243 + ... + 6596.

It is an arithmetic number, because the mean of its divisors is an integer number (1515360).

Almost surely, 2^16500003 is an apocalyptic number.

16500003 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16500003 is a deficient number, since it is larger than the sum of its proper divisors (7745757).

16500003 is a wasteful number, since it uses less digits than its factorization.

16500003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9898.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 16500003 is about 4062.0195715924. The cubic root of 16500003 is about 254.5821839122.

Adding to 16500003 its reverse (30000561), we get a palindrome (46500564).

The spelling of 16500003 in words is "sixteen million, five hundred thousand, three".