166516673 has 2 divisors, whose sum is σ = 166516674. Its totient is φ = 166516672.

The previous prime is 166516667. The next prime is 166516681. The reversal of 166516673 is 376615661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121264144 + 45252529 = 11012^2 + 6727^2 .

166516673 is a truncatable prime.

It is an emirp because it is prime and its reverse (376615661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166516673 - 2⁴ = 166516657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166516673.

It is not a weakly prime, because it can be changed into another prime (166516643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83258336 + 83258337.

It is an arithmetic number, because the mean of its divisors is an integer number (83258337).

Almost surely, 2^166516673 is an apocalyptic number.

It is an amenable number.

166516673 is a deficient number, since it is larger than the sum of its proper divisors (1).

166516673 is an equidigital number, since it uses as much as digits as its factorization.

166516673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The square root of 166516673 is about 12904.1339500177. The cubic root of 166516673 is about 550.1560692079.

The spelling of 166516673 in words is "one hundred sixty-six million, five hundred sixteen thousand, six hundred seventy-three".