166866867 has 12 divisors (see below), whose sum is σ = 241235280. Its totient is φ = 111149808.

The previous prime is 166866853. The next prime is 166866871. The reversal of 166866867 is 768668661.

It is not a de Polignac number, because 166866867 - 2⁴ = 166866851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166866877) 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 11 ways as a sum of consecutive naturals, for example, 4234 + ... + 18752.

It is an arithmetic number, because the mean of its divisors is an integer number (20102940).

Almost surely, 2^166866867 is an apocalyptic number.

166866867 is a deficient number, since it is larger than the sum of its proper divisors (74368413).

166866867 is a wasteful number, since it uses less digits than its factorization.

166866867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15802 (or 15799 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 166866867 is about 12917.6958858769. The cubic root of 166866867 is about 550.5414689587.

The spelling of 166866867 in words is "one hundred sixty-six million, eight hundred sixty-six thousand, eight hundred sixty-seven".