1326916865 has 8 divisors (see below), whose sum is σ = 1593056808. Its totient is φ = 1061029120.

The previous prime is 1326916859. The next prime is 1326916873. The reversal of 1326916865 is 5686196231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 913973824 + 412943041 = 30232^2 + 20321^2 .

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

It is not a de Polignac number, because 1326916865 - 2⁴ = 1326916849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51272 + ... + 72681.

It is an arithmetic number, because the mean of its divisors is an integer number (199132101).

Almost surely, 2^1326916865 is an apocalyptic number.

It is an amenable number.

1326916865 is a deficient number, since it is larger than the sum of its proper divisors (266139943).

1326916865 is a wasteful number, since it uses less digits than its factorization.

1326916865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126099.

The product of its digits is 466560, while the sum is 47.

The square root of 1326916865 is about 36426.8700961255. The cubic root of 1326916865 is about 1098.8740172355.

The spelling of 1326916865 in words is "one billion, three hundred twenty-six million, nine hundred sixteen thousand, eight hundred sixty-five".