166543717 has 2 divisors, whose sum is σ = 166543718. Its totient is φ = 166543716.

The previous prime is 166543703. The next prime is 166543739. The reversal of 166543717 is 717345661.

166543717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97337956 + 69205761 = 9866^2 + 8319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166543717 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166543717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166543217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83271858 + 83271859.

It is an arithmetic number, because the mean of its divisors is an integer number (83271859).

Almost surely, 2^166543717 is an apocalyptic number.

It is an amenable number.

166543717 is a deficient number, since it is larger than the sum of its proper divisors (1).

166543717 is an equidigital number, since it uses as much as digits as its factorization.

166543717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 40.

The square root of 166543717 is about 12905.1817887235. The cubic root of 166543717 is about 550.1858512413.

The spelling of 166543717 in words is "one hundred sixty-six million, five hundred forty-three thousand, seven hundred seventeen".