11066521666 has 4 divisors (see below), whose sum is σ = 16599782502. Its totient is φ = 5533260832.

The previous prime is 11066521663. The next prime is 11066521679. The reversal of 11066521666 is 66612566011.

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

It can be written as a sum of positive squares in only one way, i.e., 10819120225 + 247401441 = 104015^2 + 15729^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (11066521663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2766630415 + ... + 2766630418.

Almost surely, 2^11066521666 is an apocalyptic number.

11066521666 is a deficient number, since it is larger than the sum of its proper divisors (5533260836).

11066521666 is an equidigital number, since it uses as much as digits as its factorization.

11066521666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5533260835.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 11066521666 in words is "eleven billion, sixty-six million, five hundred twenty-one thousand, six hundred sixty-six".