166917797 has 2 divisors, whose sum is σ = 166917798. Its totient is φ = 166917796.

The previous prime is 166917791. The next prime is 166917811. The reversal of 166917797 is 797719661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164198596 + 2719201 = 12814^2 + 1649^2 .

It is a cyclic number.

It is not a de Polignac number, because 166917797 - 2¹⁸ = 166655653 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 (166917791) 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, 83458898 + 83458899.

It is an arithmetic number, because the mean of its divisors is an integer number (83458899).

Almost surely, 2^166917797 is an apocalyptic number.

It is an amenable number.

166917797 is a deficient number, since it is larger than the sum of its proper divisors (1).

166917797 is an equidigital number, since it uses as much as digits as its factorization.

166917797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1000188, while the sum is 53.

The square root of 166917797 is about 12919.6670622737. The cubic root of 166917797 is about 550.5974741349.

The spelling of 166917797 in words is "one hundred sixty-six million, nine hundred seventeen thousand, seven hundred ninety-seven".