816316673 has 4 divisors (see below), whose sum is σ = 816415188. Its totient is φ = 816218160.

The previous prime is 816316661. The next prime is 816316729. The reversal of 816316673 is 376613618.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 295427344 + 520889329 = 17188^2 + 22823^2 .

It is a cyclic number.

It is not a de Polignac number, because 816316673 - 2⁶ = 816316609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 816316673.

It is not an unprimeable number, because it can be changed into a prime (816316073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35558 + ... + 53823.

It is an arithmetic number, because the mean of its divisors is an integer number (204103797).

Almost surely, 2^816316673 is an apocalyptic number.

It is an amenable number.

816316673 is a deficient number, since it is larger than the sum of its proper divisors (98515).

816316673 is an equidigital number, since it uses as much as digits as its factorization.

816316673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98514.

The product of its digits is 108864, while the sum is 41.

The square root of 816316673 is about 28571.2560626935. The cubic root of 816316673 is about 934.5866124191.

The spelling of 816316673 in words is "eight hundred sixteen million, three hundred sixteen thousand, six hundred seventy-three".