166666668071 has 2 divisors, whose sum is σ = 166666668072. Its totient is φ = 166666668070.

The previous prime is 166666668041. The next prime is 166666668089. The reversal of 166666668071 is 170866666661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166666668071 is a prime.

It is a super-2 number, since 2×166666668071² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166666668071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166666668041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83333334035 + 83333334036.

It is an arithmetic number, because the mean of its divisors is an integer number (83333334036).

Almost surely, 2^166666668071 is an apocalyptic number.

166666668071 is a deficient number, since it is larger than the sum of its proper divisors (1).

166666668071 is an equidigital number, since it uses as much as digits as its factorization.

166666668071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15676416, while the sum is 59.

The spelling of 166666668071 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-eight thousand, seventy-one".