166788263 has 2 divisors, whose sum is σ = 166788264. Its totient is φ = 166788262.

The previous prime is 166788239. The next prime is 166788311. The reversal of 166788263 is 362887661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166788263 - 2¹⁸ = 166526119 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166788233) 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, 83394131 + 83394132.

It is an arithmetic number, because the mean of its divisors is an integer number (83394132).

Almost surely, 2^166788263 is an apocalyptic number.

166788263 is a deficient number, since it is larger than the sum of its proper divisors (1).

166788263 is an equidigital number, since it uses as much as digits as its factorization.

166788263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 47.

The square root of 166788263 is about 12914.6530344411. The cubic root of 166788263 is about 550.4550096970.

The spelling of 166788263 in words is "one hundred sixty-six million, seven hundred eighty-eight thousand, two hundred sixty-three".