166555699 has 2 divisors, whose sum is σ = 166555700. Its totient is φ = 166555698.

The previous prime is 166555679. The next prime is 166555703. The reversal of 166555699 is 996555661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166555699 - 2⁵ = 166555667 is a prime.

It is not a weakly prime, because it can be changed into another prime (166555679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83277849 + 83277850.

It is an arithmetic number, because the mean of its divisors is an integer number (83277850).

Almost surely, 2^166555699 is an apocalyptic number.

166555699 is a deficient number, since it is larger than the sum of its proper divisors (1).

166555699 is an equidigital number, since it uses as much as digits as its factorization.

166555699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187000, while the sum is 52.

The square root of 166555699 is about 12905.6460125017. The cubic root of 166555699 is about 550.1990453121.

The spelling of 166555699 in words is "one hundred sixty-six million, five hundred fifty-five thousand, six hundred ninety-nine".