166680987701 has 2 divisors, whose sum is σ = 166680987702. Its totient is φ = 166680987700.

The previous prime is 166680987691. The next prime is 166680987713. The reversal of 166680987701 is 107789086661.

166680987701 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 can be written as a sum of positive squares in only one way, i.e., 151558383025 + 15122604676 = 389305^2 + 122974^2 .

It is a cyclic number.

It is not a de Polignac number, because 166680987701 - 2⁶ = 166680987637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166680987791) 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, 83340493850 + 83340493851.

It is an arithmetic number, because the mean of its divisors is an integer number (83340493851).

Almost surely, 2^166680987701 is an apocalyptic number.

It is an amenable number.

166680987701 is a deficient number, since it is larger than the sum of its proper divisors (1).

166680987701 is an equidigital number, since it uses as much as digits as its factorization.

166680987701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6096384, while the sum is 59.

The spelling of 166680987701 in words is "one hundred sixty-six billion, six hundred eighty million, nine hundred eighty-seven thousand, seven hundred one".