166368641 has 2 divisors, whose sum is σ = 166368642. Its totient is φ = 166368640.

The previous prime is 166368583. The next prime is 166368701. The reversal of 166368641 is 146863661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166281025 + 87616 = 12895^2 + 296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166368641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (166368841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83184320 + 83184321.

It is an arithmetic number, because the mean of its divisors is an integer number (83184321).

Almost surely, 2^166368641 is an apocalyptic number.

It is an amenable number.

166368641 is a deficient number, since it is larger than the sum of its proper divisors (1).

166368641 is an equidigital number, since it uses as much as digits as its factorization.

166368641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 166368641 is about 12898.3968383672. The cubic root of 166368641 is about 549.9929927482.

The spelling of 166368641 in words is "one hundred sixty-six million, three hundred sixty-eight thousand, six hundred forty-one".