11660065565 has 4 divisors (see below), whose sum is σ = 13992078684. Its totient is φ = 9328052448.

The previous prime is 11660065541. The next prime is 11660065567. The reversal of 11660065565 is 56556006611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56556006611 = 13 ⋅4350462047.

It can be written as a sum of positive squares in 2 ways, for example, as 4407499321 + 7252566244 = 66389^2 + 85162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11660065565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11660065567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1166006552 + ... + 1166006561.

It is an arithmetic number, because the mean of its divisors is an integer number (3498019671).

Almost surely, 2^11660065565 is an apocalyptic number.

It is an amenable number.

11660065565 is a deficient number, since it is larger than the sum of its proper divisors (2332013119).

11660065565 is an equidigital number, since it uses as much as digits as its factorization.

11660065565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332013118.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 11660065565 in words is "eleven billion, six hundred sixty million, sixty-five thousand, five hundred sixty-five".