11656605111 has 4 divisors (see below), whose sum is σ = 15542140152. Its totient is φ = 7771070072.

The previous prime is 11656605109. The next prime is 11656605157. The reversal of 11656605111 is 11150665611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11656605111 - 2¹ = 11656605109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11656601111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1942767516 + ... + 1942767521.

It is an arithmetic number, because the mean of its divisors is an integer number (3885535038).

Almost surely, 2^11656605111 is an apocalyptic number.

11656605111 is a deficient number, since it is larger than the sum of its proper divisors (3885535041).

11656605111 is an equidigital number, since it uses as much as digits as its factorization.

11656605111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885535040.

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 11656605111 in words is "eleven billion, six hundred fifty-six million, six hundred five thousand, one hundred eleven".