166563073 has 2 divisors, whose sum is σ = 166563074. Its totient is φ = 166563072.

The previous prime is 166563071. The next prime is 166563083. The reversal of 166563073 is 370365661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136609344 + 29953729 = 11688^2 + 5473^2 .

It is an emirp because it is prime and its reverse (370365661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166563073 - 2¹ = 166563071 is a prime.

Together with 166563071, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166563071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83281536 + 83281537.

It is an arithmetic number, because the mean of its divisors is an integer number (83281537).

Almost surely, 2^166563073 is an apocalyptic number.

It is an amenable number.

166563073 is a deficient number, since it is larger than the sum of its proper divisors (1).

166563073 is an equidigital number, since it uses as much as digits as its factorization.

166563073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 37.

The square root of 166563073 is about 12905.9316982541. The cubic root of 166563073 is about 550.2071649339.

The spelling of 166563073 in words is "one hundred sixty-six million, five hundred sixty-three thousand, seventy-three".