16505003 has 2 divisors, whose sum is σ = 16505004. Its totient is φ = 16505002.

The previous prime is 16504993. The next prime is 16505009. The reversal of 16505003 is 30050561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16505003 - 2¹² = 16500907 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (16505009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8252501 + 8252502.

It is an arithmetic number, because the mean of its divisors is an integer number (8252502).

Almost surely, 2^16505003 is an apocalyptic number.

16505003 is a deficient number, since it is larger than the sum of its proper divisors (1).

16505003 is an equidigital number, since it uses as much as digits as its factorization.

16505003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 16505003 is about 4062.6349823729. The cubic root of 16505003 is about 254.6078966826.

Adding to 16505003 its reverse (30050561), we get a palindrome (46555564).

The spelling of 16505003 in words is "sixteen million, five hundred five thousand, three".