166566001 has 4 divisors (see below), whose sum is σ = 190361152. Its totient is φ = 142770852.

The previous prime is 166565981. The next prime is 166566013. The reversal of 166566001 is 100665661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100665661 = 127 ⋅792643.

It is not a de Polignac number, because 166566001 - 2⁵ = 166565969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166566601) 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, 11897565 + ... + 11897578.

It is an arithmetic number, because the mean of its divisors is an integer number (47590288).

Almost surely, 2^166566001 is an apocalyptic number.

It is an amenable number.

166566001 is a deficient number, since it is larger than the sum of its proper divisors (23795151).

166566001 is an equidigital number, since it uses as much as digits as its factorization.

166566001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23795150.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 166566001 is about 12906.0451339673. The cubic root of 166566001 is about 550.2103889321.

The spelling of 166566001 in words is "one hundred sixty-six million, five hundred sixty-six thousand, one".