16644502003 has 4 divisors (see below), whose sum is σ = 16664580640. Its totient is φ = 16624423368.

The previous prime is 16644501997. The next prime is 16644502013. The reversal of 16644502003 is 30020544661.

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-16644502003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16644502013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10038075 + ... + 10039732.

It is an arithmetic number, because the mean of its divisors is an integer number (4166145160).

Almost surely, 2^16644502003 is an apocalyptic number.

16644502003 is a deficient number, since it is larger than the sum of its proper divisors (20078637).

16644502003 is an equidigital number, since it uses as much as digits as its factorization.

16644502003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20078636.

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 16644502003 in words is "sixteen billion, six hundred forty-four million, five hundred two thousand, three".