211661110666 has 8 divisors (see below), whose sum is σ = 317883150144. Its totient is φ = 105700060620.

The previous prime is 211661110663. The next prime is 211661110667. The reversal of 211661110666 is 666011166112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (211661110663) 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, 65245330 + ... + 65248573.

It is an arithmetic number, because the mean of its divisors is an integer number (39735393768).

Almost surely, 2^211661110666 is an apocalyptic number.

211661110666 is a deficient number, since it is larger than the sum of its proper divisors (106222039478).

211661110666 is a wasteful number, since it uses less digits than its factorization.

211661110666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130494716.

The product of its (nonzero) digits is 15552, while the sum is 37.

Adding to 211661110666 its reverse (666011166112), we get a palindrome (877672276778).

The spelling of 211661110666 in words is "two hundred eleven billion, six hundred sixty-one million, one hundred ten thousand, six hundred sixty-six".