12856066165 has 4 divisors (see below), whose sum is σ = 15427279404. Its totient is φ = 10284852928.

The previous prime is 12856066147. The next prime is 12856066189. The reversal of 12856066165 is 56166065821.

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 3437945956 + 9418120209 = 58634^2 + 97047^2 .

It is a cyclic number.

It is not a de Polignac number, because 12856066165 - 2⁷ = 12856066037 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 3 ways as a sum of consecutive naturals, for example, 1285606612 + ... + 1285606621.

It is an arithmetic number, because the mean of its divisors is an integer number (3856819851).

Almost surely, 2^12856066165 is an apocalyptic number.

It is an amenable number.

12856066165 is a deficient number, since it is larger than the sum of its proper divisors (2571213239).

12856066165 is an equidigital number, since it uses as much as digits as its factorization.

12856066165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571213238.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 12856066165 in words is "twelve billion, eight hundred fifty-six million, sixty-six thousand, one hundred sixty-five".