166686097326641 has 2 divisors, whose sum is σ = 166686097326642. Its totient is φ = 166686097326640.

The previous prime is 166686097326607. The next prime is 166686097326811. The reversal of 166686097326641 is 146623790686661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162980968960000 + 3705128366641 = 12766400^2 + 1924871^2 .

It is a cyclic number.

It is not a de Polignac number, because 166686097326641 - 2⁶ = 166686097326577 is a prime.

It is not a weakly prime, because it can be changed into another prime (166686097326041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83343048663320 + 83343048663321.

It is an arithmetic number, because the mean of its divisors is an integer number (83343048663321).

Almost surely, 2^{166686097326641} is an apocalyptic number.

It is an amenable number.

166686097326641 is a deficient number, since it is larger than the sum of its proper divisors (1).

166686097326641 is an equidigital number, since it uses as much as digits as its factorization.

166686097326641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564350976, while the sum is 71.

The spelling of 166686097326641 in words is "one hundred sixty-six trillion, six hundred eighty-six billion, ninety-seven million, three hundred twenty-six thousand, six hundred forty-one".