166409207 has 2 divisors, whose sum is σ = 166409208. Its totient is φ = 166409206.

The previous prime is 166409203. The next prime is 166409227. The reversal of 166409207 is 702904661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166409207 - 2² = 166409203 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166409203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83204603 + 83204604.

It is an arithmetic number, because the mean of its divisors is an integer number (83204604).

Almost surely, 2^166409207 is an apocalyptic number.

166409207 is a deficient number, since it is larger than the sum of its proper divisors (1).

166409207 is an equidigital number, since it uses as much as digits as its factorization.

166409207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 166409207 is about 12899.9692635293. The cubic root of 166409207 is about 550.0376910809.

The spelling of 166409207 in words is "one hundred sixty-six million, four hundred nine thousand, two hundred seven".