166500179999 has 2 divisors, whose sum is σ = 166500180000. Its totient is φ = 166500179998.

The previous prime is 166500179939. The next prime is 166500180001. The reversal of 166500179999 is 999971005661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166500179999 - 2¹⁶ = 166500114463 is a prime.

Together with 166500180001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166500179929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83250089999 + 83250090000.

It is an arithmetic number, because the mean of its divisors is an integer number (83250090000).

Almost surely, 2^166500179999 is an apocalyptic number.

166500179999 is a deficient number, since it is larger than the sum of its proper divisors (1).

166500179999 is an equidigital number, since it uses as much as digits as its factorization.

166500179999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8266860, while the sum is 62.

The spelling of 166500179999 in words is "one hundred sixty-six billion, five hundred million, one hundred seventy-nine thousand, nine hundred ninety-nine".