11655605665 has 32 divisors (see below), whose sum is σ = 15688899072. Its totient is φ = 8239104000.

The previous prime is 11655605597. The next prime is 11655605693. The reversal of 11655605665 is 56650655611.

It is a de Polignac number, because none of the positive numbers 2^k-11655605665 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 601569 + ... + 620641.

It is an arithmetic number, because the mean of its divisors is an integer number (490278096).

Almost surely, 2^11655605665 is an apocalyptic number.

It is an amenable number.

11655605665 is a deficient number, since it is larger than the sum of its proper divisors (4033293407).

11655605665 is a wasteful number, since it uses less digits than its factorization.

11655605665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19401.

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

The spelling of 11655605665 in words is "eleven billion, six hundred fifty-five million, six hundred five thousand, six hundred sixty-five".