166816544393 has 2 divisors, whose sum is σ = 166816544394. Its totient is φ = 166816544392.

The previous prime is 166816544369. The next prime is 166816544407. The reversal of 166816544393 is 393445618661.

166816544393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143946636409 + 22869907984 = 379403^2 + 151228^2 .

It is an emirp because it is prime and its reverse (393445618661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166816544393 - 2⁶ = 166816544329 is a prime.

It is not a weakly prime, because it can be changed into another prime (166816544353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83408272196 + 83408272197.

It is an arithmetic number, because the mean of its divisors is an integer number (83408272197).

Almost surely, 2^166816544393 is an apocalyptic number.

It is an amenable number.

166816544393 is a deficient number, since it is larger than the sum of its proper divisors (1).

166816544393 is an equidigital number, since it uses as much as digits as its factorization.

166816544393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11197440, while the sum is 56.

The spelling of 166816544393 in words is "one hundred sixty-six billion, eight hundred sixteen million, five hundred forty-four thousand, three hundred ninety-three".