166540063 has 2 divisors, whose sum is σ = 166540064. Its totient is φ = 166540062.

The previous prime is 166540061. The next prime is 166540103. The reversal of 166540063 is 360045661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166540063 - 2¹ = 166540061 is a prime.

Together with 166540061, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166540061) 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, 83270031 + 83270032.

It is an arithmetic number, because the mean of its divisors is an integer number (83270032).

Almost surely, 2^166540063 is an apocalyptic number.

166540063 is a deficient number, since it is larger than the sum of its proper divisors (1).

166540063 is an equidigital number, since it uses as much as digits as its factorization.

166540063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 166540063 is about 12905.0402169075. The cubic root of 166540063 is about 550.1818274853.

The spelling of 166540063 in words is "one hundred sixty-six million, five hundred forty thousand, sixty-three".