166566043501 has 16 divisors (see below), whose sum is σ = 195788916288. Its totient is φ = 139702176000.

The previous prime is 166566043499. The next prime is 166566043529. The reversal of 166566043501 is 105340665661.

166566043501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 166566043501 - 2¹ = 166566043499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166566043801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32700 + ... + 578101.

It is an arithmetic number, because the mean of its divisors is an integer number (12236807268).

Almost surely, 2^166566043501 is an apocalyptic number.

166566043501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166566043501 is a deficient number, since it is larger than the sum of its proper divisors (29222872787).

166566043501 is a wasteful number, since it uses less digits than its factorization.

166566043501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612732.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 166566043501 in words is "one hundred sixty-six billion, five hundred sixty-six million, forty-three thousand, five hundred one".