166666673 has 2 divisors, whose sum is σ = 166666674. Its totient is φ = 166666672.

The previous prime is 166666649. The next prime is 166666693. The reversal of 166666673 is 376666661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165302449 + 1364224 = 12857^2 + 1168^2 .

It is a cyclic number.

It is not a de Polignac number, because 166666673 - 2⁸ = 166666417 is a prime.

It is not a weakly prime, because it can be changed into another prime (166666603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83333336 + 83333337.

It is an arithmetic number, because the mean of its divisors is an integer number (83333337).

Almost surely, 2^166666673 is an apocalyptic number.

It is an amenable number.

166666673 is a deficient number, since it is larger than the sum of its proper divisors (1).

166666673 is an equidigital number, since it uses as much as digits as its factorization.

166666673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 47.

The square root of 166666673 is about 12909.9447326470. The cubic root of 166666673 is about 550.3212151198.

The spelling of 166666673 in words is "one hundred sixty-six million, six hundred sixty-six thousand, six hundred seventy-three".