166866871 has 2 divisors, whose sum is σ = 166866872. Its totient is φ = 166866870.

The previous prime is 166866853. The next prime is 166866877. The reversal of 166866871 is 178668661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166866871 - 2¹⁷ = 166735799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166866877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83433435 + 83433436.

It is an arithmetic number, because the mean of its divisors is an integer number (83433436).

Almost surely, 2^166866871 is an apocalyptic number.

166866871 is a deficient number, since it is larger than the sum of its proper divisors (1).

166866871 is an equidigital number, since it uses as much as digits as its factorization.

166866871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 49.

The square root of 166866871 is about 12917.6960407032. The cubic root of 166866871 is about 550.5414733577.

The spelling of 166866871 in words is "one hundred sixty-six million, eight hundred sixty-six thousand, eight hundred seventy-one".