166650647 has 2 divisors, whose sum is σ = 166650648. Its totient is φ = 166650646.

The previous prime is 166650619. The next prime is 166650667. The reversal of 166650647 is 746056661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166650647 - 2²⁰ = 165602071 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166650667) 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, 83325323 + 83325324.

It is an arithmetic number, because the mean of its divisors is an integer number (83325324).

Almost surely, 2^166650647 is an apocalyptic number.

166650647 is a deficient number, since it is larger than the sum of its proper divisors (1).

166650647 is an equidigital number, since it uses as much as digits as its factorization.

166650647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 166650647 is about 12909.3240334264. The cubic root of 166650647 is about 550.3035756595.

The spelling of 166650647 in words is "one hundred sixty-six million, six hundred fifty thousand, six hundred forty-seven".