166668333331 has 2 divisors, whose sum is σ = 166668333332. Its totient is φ = 166668333330.

The previous prime is 166668333323. The next prime is 166668333343. The reversal of 166668333331 is 133333866661.

166668333331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (133333866661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166668333331 - 2³ = 166668333323 is a prime.

It is a super-2 number, since 2×166668333331² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166668363331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83334166665 + 83334166666.

It is an arithmetic number, because the mean of its divisors is an integer number (83334166666).

Almost surely, 2^166668333331 is an apocalyptic number.

166668333331 is a deficient number, since it is larger than the sum of its proper divisors (1).

166668333331 is an equidigital number, since it uses as much as digits as its factorization.

166668333331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 49.

The spelling of 166668333331 in words is "one hundred sixty-six billion, six hundred sixty-eight million, three hundred thirty-three thousand, three hundred thirty-one".