166640611 has 2 divisors, whose sum is σ = 166640612. Its totient is φ = 166640610.

The previous prime is 166640597. The next prime is 166640651. The reversal of 166640611 is 116046661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166640611 - 2⁹ = 166640099 is a prime.

It is not a weakly prime, because it can be changed into another prime (166640651) 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, 83320305 + 83320306.

It is an arithmetic number, because the mean of its divisors is an integer number (83320306).

Almost surely, 2^166640611 is an apocalyptic number.

166640611 is a deficient number, since it is larger than the sum of its proper divisors (1).

166640611 is an equidigital number, since it uses as much as digits as its factorization.

166640611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 166640611 is about 12908.9353162838. The cubic root of 166640611 is about 550.2925286826.

The spelling of 166640611 in words is "one hundred sixty-six million, six hundred forty thousand, six hundred eleven".