166605561166 has 16 divisors (see below), whose sum is σ = 276078263040. Its totient is φ = 74771194680.

The previous prime is 166605561149. The next prime is 166605561167. The reversal of 166605561166 is 661165506661.

It is a super-2 number, since 2×166605561166² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166605561167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47928516 + ... + 47931991.

It is an arithmetic number, because the mean of its divisors is an integer number (17254891440).

Almost surely, 2^166605561166 is an apocalyptic number.

166605561166 is a deficient number, since it is larger than the sum of its proper divisors (109472701874).

166605561166 is a wasteful number, since it uses less digits than its factorization.

166605561166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95860599.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 166605561166 in words is "one hundred sixty-six billion, six hundred five million, five hundred sixty-one thousand, one hundred sixty-six".