166666666071 has 4 divisors (see below), whose sum is σ = 222222221432. Its totient is φ = 111111110712.

The previous prime is 166666666037. The next prime is 166666666087. The reversal of 166666666071 is 170666666661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 170666666661 = 3 ⋅56888888887.

It is not a de Polignac number, because 166666666071 - 2⁷ = 166666665943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666666021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27777777676 + ... + 27777777681.

It is an arithmetic number, because the mean of its divisors is an integer number (55555555358).

Almost surely, 2^166666666071 is an apocalyptic number.

166666666071 is a deficient number, since it is larger than the sum of its proper divisors (55555555361).

166666666071 is an equidigital number, since it uses as much as digits as its factorization.

166666666071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55555555360.

The product of its (nonzero) digits is 11757312, while the sum is 57.

The spelling of 166666666071 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, seventy-one".