166980871 has 2 divisors, whose sum is σ = 166980872. Its totient is φ = 166980870.

The previous prime is 166980859. The next prime is 166980881. The reversal of 166980871 is 178089661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166980871 - 2¹⁷ = 166849799 is a prime.

It is a super-2 number, since 2×166980871² = 55765222559837282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166980881) 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, 83490435 + 83490436.

It is an arithmetic number, because the mean of its divisors is an integer number (83490436).

Almost surely, 2^166980871 is an apocalyptic number.

166980871 is a deficient number, since it is larger than the sum of its proper divisors (1).

166980871 is an equidigital number, since it uses as much as digits as its factorization.

166980871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 166980871 is about 12922.1078388938. The cubic root of 166980871 is about 550.6668176726. Note that the first 3 decimals are identical.

The spelling of 166980871 in words is "one hundred sixty-six million, nine hundred eighty thousand, eight hundred seventy-one".