1327871665 has 8 divisors (see below), whose sum is σ = 1593788328. Its totient is φ = 1062069120.

The previous prime is 1327871659. The next prime is 1327871687. The reversal of 1327871665 is 5661787231.

It can be written as a sum of positive squares in 4 ways, for example, as 134652816 + 1193218849 = 11604^2 + 34543^2 .

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

It is not a de Polignac number, because 1327871665 - 2¹⁷ = 1327740593 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406 + ... + 51535.

It is an arithmetic number, because the mean of its divisors is an integer number (199223541).

Almost surely, 2^1327871665 is an apocalyptic number.

It is an amenable number.

1327871665 is a deficient number, since it is larger than the sum of its proper divisors (265916663).

1327871665 is an equidigital number, since it uses as much as digits as its factorization.

1327871665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57059.

The product of its digits is 423360, while the sum is 46.

The square root of 1327871665 is about 36439.9734494964. The cubic root of 1327871665 is about 1099.1375236600.

The spelling of 1327871665 in words is "one billion, three hundred twenty-seven million, eight hundred seventy-one thousand, six hundred sixty-five".