11665405611 has 12 divisors (see below), whose sum is σ = 16856876088. Its totient is φ = 7773777504.

The previous prime is 11665405607. The next prime is 11665405663. The reversal of 11665405611 is 11650456611.

11665405611 is a `hidden beast` number, since 1 + 1 + 66 + 540 + 56 + 1 + 1 = 666.

It is not a de Polignac number, because 11665405611 - 2² = 11665405607 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (11665405111) 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 11 ways as a sum of consecutive naturals, for example, 239805 + ... + 284318.

It is an arithmetic number, because the mean of its divisors is an integer number (1404739674).

Almost surely, 2^11665405611 is an apocalyptic number.

11665405611 is a deficient number, since it is larger than the sum of its proper divisors (5191470477).

11665405611 is a wasteful number, since it uses less digits than its factorization.

11665405611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526602 (or 526599 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 11665405611 in words is "eleven billion, six hundred sixty-five million, four hundred five thousand, six hundred eleven".