11616665605 has 4 divisors (see below), whose sum is σ = 13939998732. Its totient is φ = 9293332480.

The previous prime is 11616665597. The next prime is 11616665689. The reversal of 11616665605 is 50656661611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50656661611 = 28753 ⋅1761787.

It can be written as a sum of positive squares in 2 ways, for example, as 6508132929 + 5108532676 = 80673^2 + 71474^2 .

It is not a de Polignac number, because 11616665605 - 2³ = 11616665597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1161666556 + ... + 1161666565.

It is an arithmetic number, because the mean of its divisors is an integer number (3484999683).

Almost surely, 2^11616665605 is an apocalyptic number.

It is an amenable number.

11616665605 is a deficient number, since it is larger than the sum of its proper divisors (2323333127).

11616665605 is an equidigital number, since it uses as much as digits as its factorization.

11616665605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323333126.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 11616665605 in words is "eleven billion, six hundred sixteen million, six hundred sixty-five thousand, six hundred five".