16660013 has 2 divisors, whose sum is σ = 16660014. Its totient is φ = 16660012.

The previous prime is 16659997. The next prime is 16660031. The reversal of 16660013 is 31006661.

Together with next prime (16660031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16630084 + 29929 = 4078^2 + 173^2 .

It is a cyclic number.

It is not a de Polignac number, because 16660013 - 2⁴ = 16659997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16660313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330006 + 8330007.

It is an arithmetic number, because the mean of its divisors is an integer number (8330007).

Almost surely, 2^16660013 is an apocalyptic number.

It is an amenable number.

16660013 is a deficient number, since it is larger than the sum of its proper divisors (1).

16660013 is an equidigital number, since it uses as much as digits as its factorization.

16660013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 16660013 is about 4081.6679188783. The cubic root of 16660013 is about 255.4024811566.

Adding to 16660013 its reverse (31006661), we get a palindrome (47666674).

The spelling of 16660013 in words is "sixteen million, six hundred sixty thousand, thirteen".