65005551165605 has 8 divisors (see below), whose sum is σ = 78186815353752. Its totient is φ = 51884338295808.

The previous prime is 65005551165557. The next prime is 65005551165647. The reversal of 65005551165605 is 50656115550056.

It can be written as a sum of positive squares in 4 ways, for example, as 404096690596 + 64601454475009 = 635686^2 + 8037503^2 .

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 65005551165605 - 2³⁴ = 64988371296421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15012827204 + ... + 15012831533.

It is an arithmetic number, because the mean of its divisors is an integer number (9773351919219).

Almost surely, 2^{65005551165605} is an apocalyptic number.

It is an amenable number.

65005551165605 is a deficient number, since it is larger than the sum of its proper divisors (13181264188147).

65005551165605 is a wasteful number, since it uses less digits than its factorization.

65005551165605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30025659175.

The product of its (nonzero) digits is 3375000, while the sum is 50.

The spelling of 65005551165605 in words is "sixty-five trillion, five billion, five hundred fifty-one million, one hundred sixty-five thousand, six hundred five".