16605013 has 4 divisors (see below), whose sum is σ = 16614540. Its totient is φ = 16595488.

The previous prime is 16604999. The next prime is 16605037. The reversal of 16605013 is 31050661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13704804 + 2900209 = 3702^2 + 1703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16605013 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16605613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1318 + ... + 5911.

It is an arithmetic number, because the mean of its divisors is an integer number (4153635).

Almost surely, 2^16605013 is an apocalyptic number.

It is an amenable number.

16605013 is a deficient number, since it is larger than the sum of its proper divisors (9527).

16605013 is an equidigital number, since it uses as much as digits as its factorization.

16605013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9526.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 16605013 is about 4074.9249072836. The cubic root of 16605013 is about 255.1211163722.

Adding to 16605013 its reverse (31050661), we get a palindrome (47655674).

The spelling of 16605013 in words is "sixteen million, six hundred five thousand, thirteen".