166659280871 has 2 divisors, whose sum is σ = 166659280872. Its totient is φ = 166659280870.

The previous prime is 166659280867. The next prime is 166659280873. The reversal of 166659280871 is 178082956661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166659280871 - 2² = 166659280867 is a prime.

Together with 166659280873, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166659280871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166659280873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83329640435 + 83329640436.

It is an arithmetic number, because the mean of its divisors is an integer number (83329640436).

Almost surely, 2^166659280871 is an apocalyptic number.

166659280871 is a deficient number, since it is larger than the sum of its proper divisors (1).

166659280871 is an equidigital number, since it uses as much as digits as its factorization.

166659280871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 59.

The spelling of 166659280871 in words is "one hundred sixty-six billion, six hundred fifty-nine million, two hundred eighty thousand, eight hundred seventy-one".