169943218790393 has 2 divisors, whose sum is σ = 169943218790394. Its totient is φ = 169943218790392.

The previous prime is 169943218790341. The next prime is 169943218790413. The reversal of 169943218790393 is 393097812349961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166312928760169 + 3630290030224 = 12896237^2 + 1905332^2 .

It is a cyclic number.

It is not a de Polignac number, because 169943218790393 - 2¹⁸ = 169943218528249 is a prime.

It is a super-2 number, since 2×169943218790393² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 169943218790393.

It is not a weakly prime, because it can be changed into another prime (169943218792393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84971609395196 + 84971609395197.

It is an arithmetic number, because the mean of its divisors is an integer number (84971609395197).

Almost surely, 2^{169943218790393} is an apocalyptic number.

It is an amenable number.

169943218790393 is a deficient number, since it is larger than the sum of its proper divisors (1).

169943218790393 is an equidigital number, since it uses as much as digits as its factorization.

169943218790393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476171136, while the sum is 74.

The spelling of 169943218790393 in words is "one hundred sixty-nine trillion, nine hundred forty-three billion, two hundred eighteen million, seven hundred ninety thousand, three hundred ninety-three".