166982909 has 2 divisors, whose sum is σ = 166982910. Its totient is φ = 166982908.

The previous prime is 166982903. The next prime is 166982911. The reversal of 166982909 is 909289661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163277284 + 3705625 = 12778^2 + 1925^2 .

It is a cyclic number.

It is not a de Polignac number, because 166982909 - 2²⁰ = 165934333 is a prime.

Together with 166982911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166982903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83491454 + 83491455.

It is an arithmetic number, because the mean of its divisors is an integer number (83491455).

Almost surely, 2^166982909 is an apocalyptic number.

It is an amenable number.

166982909 is a deficient number, since it is larger than the sum of its proper divisors (1).

166982909 is an equidigital number, since it uses as much as digits as its factorization.

166982909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 166982909 is about 12922.1866957570. The cubic root of 166982909 is about 550.6690579580.

The spelling of 166982909 in words is "one hundred sixty-six million, nine hundred eighty-two thousand, nine hundred nine".