166666851679 has 2 divisors, whose sum is σ = 166666851680. Its totient is φ = 166666851678.

The previous prime is 166666851671. The next prime is 166666851707. The reversal of 166666851679 is 976158666661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166666851679 - 2³ = 166666851671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166666851671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83333425839 + 83333425840.

It is an arithmetic number, because the mean of its divisors is an integer number (83333425840).

Almost surely, 2^166666851679 is an apocalyptic number.

166666851679 is a deficient number, since it is larger than the sum of its proper divisors (1).

166666851679 is an equidigital number, since it uses as much as digits as its factorization.

166666851679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117573120, while the sum is 67.

The spelling of 166666851679 in words is "one hundred sixty-six billion, six hundred sixty-six million, eight hundred fifty-one thousand, six hundred seventy-nine".