11661055605 has 48 divisors (see below), whose sum is σ = 20774557440. Its totient is φ = 6046545024.

The previous prime is 11661055597. The next prime is 11661055607. The reversal of 11661055605 is 50655016611.

It is not a de Polignac number, because 11661055605 - 2³ = 11661055597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11661055605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661055607) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 3966226 + ... + 3969164.

It is an arithmetic number, because the mean of its divisors is an integer number (432803280).

Almost surely, 2^11661055605 is an apocalyptic number.

11661055605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11661055605 is a deficient number, since it is larger than the sum of its proper divisors (9113501835).

11661055605 is a wasteful number, since it uses less digits than its factorization.

11661055605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5370 (or 5367 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 11661055605 in words is "eleven billion, six hundred sixty-one million, fifty-five thousand, six hundred five".