166705865113 has 2 divisors, whose sum is σ = 166705865114. Its totient is φ = 166705865112.

The previous prime is 166705864999. The next prime is 166705865189. The reversal of 166705865113 is 311568507661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145414094224 + 21291770889 = 381332^2 + 145917^2 .

It is a cyclic number.

It is not a de Polignac number, because 166705865113 - 2⁹ = 166705864601 is a prime.

It is not a weakly prime, because it can be changed into another prime (166705868113) 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, 83352932556 + 83352932557.

It is an arithmetic number, because the mean of its divisors is an integer number (83352932557).

Almost surely, 2^166705865113 is an apocalyptic number.

It is an amenable number.

166705865113 is a deficient number, since it is larger than the sum of its proper divisors (1).

166705865113 is an equidigital number, since it uses as much as digits as its factorization.

166705865113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 49.

The spelling of 166705865113 in words is "one hundred sixty-six billion, seven hundred five million, eight hundred sixty-five thousand, one hundred thirteen".