166605011 has 2 divisors, whose sum is σ = 166605012. Its totient is φ = 166605010.

The previous prime is 166605001. The next prime is 166605037. The reversal of 166605011 is 110506661.

It is an a-pointer prime, because the next prime (166605037) can be obtained adding 166605011 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166605011 - 2¹⁸ = 166342867 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166605001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83302505 + 83302506.

It is an arithmetic number, because the mean of its divisors is an integer number (83302506).

Almost surely, 2^166605011 is an apocalyptic number.

166605011 is a deficient number, since it is larger than the sum of its proper divisors (1).

166605011 is an equidigital number, since it uses as much as digits as its factorization.

166605011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 166605011 is about 12907.5563527726. The cubic root of 166605011 is about 550.2533389374.

The spelling of 166605011 in words is "one hundred sixty-six million, six hundred five thousand, eleven".