166564927 has 2 divisors, whose sum is σ = 166564928. Its totient is φ = 166564926.

The previous prime is 166564921. The next prime is 166564949. The reversal of 166564927 is 729465661.

It is a weak prime.

It is an emirp because it is prime and its reverse (729465661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166564927 - 2⁷ = 166564799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166564921) 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, 83282463 + 83282464.

It is an arithmetic number, because the mean of its divisors is an integer number (83282464).

Almost surely, 2^166564927 is an apocalyptic number.

166564927 is a deficient number, since it is larger than the sum of its proper divisors (1).

166564927 is an equidigital number, since it uses as much as digits as its factorization.

166564927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 46.

The square root of 166564927 is about 12906.0035254915. The cubic root of 166564927 is about 550.2092063634.

The spelling of 166564927 in words is "one hundred sixty-six million, five hundred sixty-four thousand, nine hundred twenty-seven".