1328521706065 has 8 divisors (see below), whose sum is σ = 1594409744808. Its totient is φ = 1062694899840.

The previous prime is 1328521706059. The next prime is 1328521706087. The reversal of 1328521706065 is 5606071258231.

It can be written as a sum of positive squares in 4 ways, for example, as 98365658689 + 1230156047376 = 313633^2 + 1109124^2 .

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

It is not a de Polignac number, because 1328521706065 - 2¹¹ = 1328521704017 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, 15260382 + ... + 15347191.

It is an arithmetic number, because the mean of its divisors is an integer number (199301218101).

Almost surely, 2^{1328521706065} is an apocalyptic number.

It is an amenable number.

1328521706065 is a deficient number, since it is larger than the sum of its proper divisors (265888038743).

1328521706065 is an equidigital number, since it uses as much as digits as its factorization.

1328521706065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30616259.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 1328521706065 in words is "one trillion, three hundred twenty-eight billion, five hundred twenty-one million, seven hundred six thousand, sixty-five".