168503415778693 has 2 divisors, whose sum is σ = 168503415778694. Its totient is φ = 168503415778692.

The previous prime is 168503415778639. The next prime is 168503415778729. The reversal of 168503415778693 is 396877514305861.

Together with previous prime (168503415778639) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129319609246884 + 39183806531809 = 11371878^2 + 6259697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168503415778693 is a prime.

It is a super-2 number, since 2×168503415778693² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168503415778603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84251707889346 + 84251707889347.

It is an arithmetic number, because the mean of its divisors is an integer number (84251707889347).

Almost surely, 2^{168503415778693} is an apocalyptic number.

It is an amenable number.

168503415778693 is a deficient number, since it is larger than the sum of its proper divisors (1).

168503415778693 is an equidigital number, since it uses as much as digits as its factorization.

168503415778693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 914457600, while the sum is 73.

The spelling of 168503415778693 in words is "one hundred sixty-eight trillion, five hundred three billion, four hundred fifteen million, seven hundred seventy-eight thousand, six hundred ninety-three".