1616665013 has 8 divisors (see below), whose sum is σ = 1660868280. Its totient is φ = 1572488640.

The previous prime is 1616664979. The next prime is 1616665051. The reversal of 1616665013 is 3105666161.

It can be written as a sum of positive squares in 4 ways, for example, as 157577809 + 1459087204 = 12553^2 + 38198^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1616665013 - 2⁶ = 1616664949 is a prime.

It is a super-2 number, since 2×1616665013² = 5227211528516580338, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616665093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202583 + ... + 210411.

It is an arithmetic number, because the mean of its divisors is an integer number (207608535).

Almost surely, 2^1616665013 is an apocalyptic number.

It is an amenable number.

1616665013 is a deficient number, since it is larger than the sum of its proper divisors (44203267).

1616665013 is an equidigital number, since it uses as much as digits as its factorization.

1616665013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13447.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1616665013 is about 40207.7730420375. The cubic root of 1616665013 is about 1173.6538107366.

The spelling of 1616665013 in words is "one billion, six hundred sixteen million, six hundred sixty-five thousand, thirteen".