166678871 has 2 divisors, whose sum is σ = 166678872. Its totient is φ = 166678870.

The previous prime is 166678867. The next prime is 166678913. The reversal of 166678871 is 178876661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166678871 - 2² = 166678867 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166678271) 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 as a sum of consecutive naturals, namely, 83339435 + 83339436.

It is an arithmetic number, because the mean of its divisors is an integer number (83339436).

Almost surely, 2^166678871 is an apocalyptic number.

166678871 is a deficient number, since it is larger than the sum of its proper divisors (1).

166678871 is an equidigital number, since it uses as much as digits as its factorization.

166678871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 50.

The square root of 166678871 is about 12910.4171505029. The cubic root of 166678871 is about 550.3346404282.

The spelling of 166678871 in words is "one hundred sixty-six million, six hundred seventy-eight thousand, eight hundred seventy-one".