11211053566566 has 16 divisors (see below), whose sum is σ = 25625265295104. Its totient is φ = 3203158161864.

The previous prime is 11211053566483. The next prime is 11211053566589. The reversal of 11211053566566 is 66566535011211.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133464923370 + ... + 133464923453.

It is an arithmetic number, because the mean of its divisors is an integer number (1601579080944).

Almost surely, 2^{11211053566566} is an apocalyptic number.

11211053566566 is an abundant number, since it is smaller than the sum of its proper divisors (14414211728538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11211053566566 is a wasteful number, since it uses less digits than its factorization.

11211053566566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266929846835.

The product of its (nonzero) digits is 972000, while the sum is 48.

Adding to 11211053566566 its reverse (66566535011211), we get a palindrome (77777588577777).

The spelling of 11211053566566 in words is "eleven trillion, two hundred eleven billion, fifty-three million, five hundred sixty-six thousand, five hundred sixty-six".