11605655665 has 4 divisors (see below), whose sum is σ = 13926786804. Its totient is φ = 9284524528.

The previous prime is 11605655657. The next prime is 11605655671. The reversal of 11605655665 is 56655650611.

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 9263870001 + 2341785664 = 96249^2 + 48392^2 .

It is a cyclic number.

It is not a de Polignac number, because 11605655665 - 2³ = 11605655657 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1160565562 + ... + 1160565571.

It is an arithmetic number, because the mean of its divisors is an integer number (3481696701).

Almost surely, 2^11605655665 is an apocalyptic number.

It is an amenable number.

11605655665 is a deficient number, since it is larger than the sum of its proper divisors (2321131139).

11605655665 is an equidigital number, since it uses as much as digits as its factorization.

11605655665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2321131138.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 11605655665 in words is "eleven billion, six hundred five million, six hundred fifty-five thousand, six hundred sixty-five".