166060991 has 2 divisors, whose sum is σ = 166060992. Its totient is φ = 166060990.

The previous prime is 166060933. The next prime is 166061033. The reversal of 166060991 is 199060661.

It is a strong prime.

It is an emirp because it is prime and its reverse (199060661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166060991 - 2¹⁰ = 166059967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166060691) 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, 83030495 + 83030496.

It is an arithmetic number, because the mean of its divisors is an integer number (83030496).

Almost surely, 2^166060991 is an apocalyptic number.

166060991 is a deficient number, since it is larger than the sum of its proper divisors (1).

166060991 is an equidigital number, since it uses as much as digits as its factorization.

166060991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 166060991 is about 12886.4654191908. The cubic root of 166060991 is about 549.6537666596.

The spelling of 166060991 in words is "one hundred sixty-six million, sixty thousand, nine hundred ninety-one".