11666166601566 has 8 divisors (see below), whose sum is σ = 23332333203144. Its totient is φ = 3888722200520.

The previous prime is 11666166601561. The next prime is 11666166601597. The reversal of 11666166601566 is 66510666166611.

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

11666166601566 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666166601561) 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, 972180550125 + ... + 972180550136.

It is an arithmetic number, because the mean of its divisors is an integer number (2916541650393).

Almost surely, 2^{11666166601566} is an apocalyptic number.

11666166601566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

11666166601566 is a wasteful number, since it uses less digits than its factorization.

11666166601566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944361100266.

The product of its (nonzero) digits is 8398080, while the sum is 57.

The spelling of 11666166601566 in words is "eleven trillion, six hundred sixty-six billion, one hundred sixty-six million, six hundred one thousand, five hundred sixty-six".