11666606066566 has 32 divisors (see below), whose sum is σ = 19416757743360. Its totient is φ = 5212483687200.

The previous prime is 11666606066519. The next prime is 11666606066567. The reversal of 11666606066566 is 66566060666611.

11666606066566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11666606066566² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666606066567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10146031 + ... + 11237221.

It is an arithmetic number, because the mean of its divisors is an integer number (606773679480).

Almost surely, 2^{11666606066566} is an apocalyptic number.

11666606066566 is a deficient number, since it is larger than the sum of its proper divisors (7750151676794).

11666606066566 is a wasteful number, since it uses less digits than its factorization.

11666606066566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099500.

The product of its (nonzero) digits is 50388480, while the sum is 61.

The spelling of 11666606066566 in words is "eleven trillion, six hundred sixty-six billion, six hundred six million, sixty-six thousand, five hundred sixty-six".