166745573 has 2 divisors, whose sum is σ = 166745574. Its totient is φ = 166745572.

The previous prime is 166745521. The next prime is 166745591. The reversal of 166745573 is 375547661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166745569 + 4 = 12913^2 + 2^2 .

It is an emirp because it is prime and its reverse (375547661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166745573 - 2¹⁶ = 166680037 is a prime.

It is a super-2 number, since 2×166745573² = 55608172230196658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166744573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83372786 + 83372787.

It is an arithmetic number, because the mean of its divisors is an integer number (83372787).

Almost surely, 2^166745573 is an apocalyptic number.

It is an amenable number.

166745573 is a deficient number, since it is larger than the sum of its proper divisors (1).

166745573 is an equidigital number, since it uses as much as digits as its factorization.

166745573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529200, while the sum is 44.

The square root of 166745573 is about 12913.0001548827. Note that the first 3 decimals coincide. The cubic root of 166745573 is about 550.4080421044.

The spelling of 166745573 in words is "one hundred sixty-six million, seven hundred forty-five thousand, five hundred seventy-three".