166655111573 has 2 divisors, whose sum is σ = 166655111574. Its totient is φ = 166655111572.

The previous prime is 166655111537. The next prime is 166655111621. The reversal of 166655111573 is 375111556661.

Together with previous prime (166655111537) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90822068689 + 75833042884 = 301367^2 + 275378^2 .

It is a cyclic number.

It is not a de Polignac number, because 166655111573 - 2³² = 162360144277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166655111873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83327555786 + 83327555787.

It is an arithmetic number, because the mean of its divisors is an integer number (83327555787).

Almost surely, 2^166655111573 is an apocalyptic number.

It is an amenable number.

166655111573 is a deficient number, since it is larger than the sum of its proper divisors (1).

166655111573 is an equidigital number, since it uses as much as digits as its factorization.

166655111573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567000, while the sum is 47.

The spelling of 166655111573 in words is "one hundred sixty-six billion, six hundred fifty-five million, one hundred eleven thousand, five hundred seventy-three".