11512170665 has 4 divisors (see below), whose sum is σ = 13814604804. Its totient is φ = 9209736528.

The previous prime is 11512170613. The next prime is 11512170673. The reversal of 11512170665 is 56607121511.

11512170665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1517569936 + 9994600729 = 38956^2 + 99973^2 .

It is a cyclic number.

It is not a de Polignac number, because 11512170665 - 2³² = 7217203369 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 3 ways as a sum of consecutive naturals, for example, 1151217062 + ... + 1151217071.

It is an arithmetic number, because the mean of its divisors is an integer number (3453651201).

Almost surely, 2^11512170665 is an apocalyptic number.

It is an amenable number.

11512170665 is a deficient number, since it is larger than the sum of its proper divisors (2302434139).

11512170665 is an equidigital number, since it uses as much as digits as its factorization.

11512170665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302434138.

The product of its (nonzero) digits is 12600, while the sum is 35.

The spelling of 11512170665 in words is "eleven billion, five hundred twelve million, one hundred seventy thousand, six hundred sixty-five".