166593626489 has 2 divisors, whose sum is σ = 166593626490. Its totient is φ = 166593626488.

The previous prime is 166593626431. The next prime is 166593626491. The reversal of 166593626489 is 984626395661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97676876089 + 68916750400 = 312533^2 + 262520^2 .

It is an emirp because it is prime and its reverse (984626395661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166593626489 is a prime.

Together with 166593626491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166593626189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83296813244 + 83296813245.

It is an arithmetic number, because the mean of its divisors is an integer number (83296813245).

Almost surely, 2^166593626489 is an apocalyptic number.

It is an amenable number.

166593626489 is a deficient number, since it is larger than the sum of its proper divisors (1).

166593626489 is an equidigital number, since it uses as much as digits as its factorization.

166593626489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100776960, while the sum is 65.

The spelling of 166593626489 in words is "one hundred sixty-six billion, five hundred ninety-three million, six hundred twenty-six thousand, four hundred eighty-nine".