166863158573 has 2 divisors, whose sum is σ = 166863158574. Its totient is φ = 166863158572.

The previous prime is 166863158513. The next prime is 166863158603. The reversal of 166863158573 is 375851368661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122267010889 + 44596147684 = 349667^2 + 211178^2 .

It is an emirp because it is prime and its reverse (375851368661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166863158573 - 2⁶ = 166863158509 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166863158513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83431579286 + 83431579287.

It is an arithmetic number, because the mean of its divisors is an integer number (83431579287).

Almost surely, 2^166863158573 is an apocalyptic number.

It is an amenable number.

166863158573 is a deficient number, since it is larger than the sum of its proper divisors (1).

166863158573 is an equidigital number, since it uses as much as digits as its factorization.

166863158573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21772800, while the sum is 59.

The spelling of 166863158573 in words is "one hundred sixty-six billion, eight hundred sixty-three million, one hundred fifty-eight thousand, five hundred seventy-three".