168503415778729 has 2 divisors, whose sum is σ = 168503415778730. Its totient is φ = 168503415778728.

The previous prime is 168503415778693. The next prime is 168503415778751. The reversal of 168503415778729 is 927877514305861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155002002000400 + 13501413778329 = 12449980^2 + 3674427^2 .

It is a cyclic number.

It is not a de Polignac number, because 168503415778729 - 2¹⁵ = 168503415745961 is a prime.

It is a super-2 number, since 2×168503415778729² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (168503415728729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84251707889364 + 84251707889365.

It is an arithmetic number, because the mean of its divisors is an integer number (84251707889365).

It is a 1-persistent number, because it is pandigital, but 2⋅168503415778729 = 337006831557458 is not.

Almost surely, 2^{168503415778729} is an apocalyptic number.

It is an amenable number.

168503415778729 is a deficient number, since it is larger than the sum of its proper divisors (1).

168503415778729 is an equidigital number, since it uses as much as digits as its factorization.

168503415778729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 711244800, while the sum is 73.

The spelling of 168503415778729 in words is "one hundred sixty-eight trillion, five hundred three billion, four hundred fifteen million, seven hundred seventy-eight thousand, seven hundred twenty-nine".