166671611 has 2 divisors, whose sum is σ = 166671612. Its totient is φ = 166671610.

The previous prime is 166671607. The next prime is 166671623. The reversal of 166671611 is 116176661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166671611 - 2² = 166671607 is a prime.

It is not a weakly prime, because it can be changed into another prime (166671641) 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, 83335805 + 83335806.

It is an arithmetic number, because the mean of its divisors is an integer number (83335806).

Almost surely, 2^166671611 is an apocalyptic number.

166671611 is a deficient number, since it is larger than the sum of its proper divisors (1).

166671611 is an equidigital number, since it uses as much as digits as its factorization.

166671611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 166671611 is about 12910.1359791444. The cubic root of 166671611 is about 550.3266500383.

The spelling of 166671611 in words is "one hundred sixty-six million, six hundred seventy-one thousand, six hundred eleven".