166650101 has 4 divisors (see below), whose sum is σ = 168300204. Its totient is φ = 165000000.

The previous prime is 166650091. The next prime is 166650103. The reversal of 166650101 is 101056661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148596100 + 18054001 = 12190^2 + 4249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166650101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166650103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 824900 + ... + 825101.

It is an arithmetic number, because the mean of its divisors is an integer number (42075051).

Almost surely, 2^166650101 is an apocalyptic number.

It is an amenable number.

166650101 is a deficient number, since it is larger than the sum of its proper divisors (1650103).

166650101 is a wasteful number, since it uses less digits than its factorization.

166650101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650102.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 166650101 is about 12909.3028859036. The cubic root of 166650101 is about 550.3029746696.

The spelling of 166650101 in words is "one hundred sixty-six million, six hundred fifty thousand, one hundred one".