11166566511 has 4 divisors (see below), whose sum is σ = 14888755352. Its totient is φ = 7444377672.

The previous prime is 11166566491. The next prime is 11166566519. The reversal of 11166566511 is 11566566111.

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

It is not a de Polignac number, because 11166566511 - 2⁵ = 11166566479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11166566511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11166566519) 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, 1861094416 + ... + 1861094421.

It is an arithmetic number, because the mean of its divisors is an integer number (3722188838).

Almost surely, 2^11166566511 is an apocalyptic number.

11166566511 is a deficient number, since it is larger than the sum of its proper divisors (3722188841).

11166566511 is an equidigital number, since it uses as much as digits as its factorization.

11166566511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722188840.

The product of its digits is 32400, while the sum is 39.

The spelling of 11166566511 in words is "eleven billion, one hundred sixty-six million, five hundred sixty-six thousand, five hundred eleven".