166665011 has 2 divisors, whose sum is σ = 166665012. Its totient is φ = 166665010.

The previous prime is 166664963. The next prime is 166665043. The reversal of 166665011 is 110566661.

It is an a-pointer prime, because the next prime (166665043) can be obtained adding 166665011 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166665011 - 2¹⁸ = 166402867 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166665091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83332505 + 83332506.

It is an arithmetic number, because the mean of its divisors is an integer number (83332506).

Almost surely, 2^166665011 is an apocalyptic number.

166665011 is a deficient number, since it is larger than the sum of its proper divisors (1).

166665011 is an equidigital number, since it uses as much as digits as its factorization.

166665011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 166665011 is about 12909.8803635045. The cubic root of 166665011 is about 550.3193858461.

It can be divided in two parts, 1666650 and 11, that added together give a palindrome (1666661).

The spelling of 166665011 in words is "one hundred sixty-six million, six hundred sixty-five thousand, eleven".