168040726409 has 2 divisors, whose sum is σ = 168040726410. Its totient is φ = 168040726408.

The previous prime is 168040726327. The next prime is 168040726487. The reversal of 168040726409 is 904627040861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146842240000 + 21198486409 = 383200^2 + 145597^2 .

It is a cyclic number.

It is not a de Polignac number, because 168040726409 - 2²⁰ = 168039677833 is a prime.

It is not a weakly prime, because it can be changed into another prime (168040725409) 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, 84020363204 + 84020363205.

It is an arithmetic number, because the mean of its divisors is an integer number (84020363205).

Almost surely, 2^168040726409 is an apocalyptic number.

It is an amenable number.

168040726409 is a deficient number, since it is larger than the sum of its proper divisors (1).

168040726409 is an equidigital number, since it uses as much as digits as its factorization.

168040726409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 168040726409 in words is "one hundred sixty-eight billion, forty million, seven hundred twenty-six thousand, four hundred nine".