168758422681 has 2 divisors, whose sum is σ = 168758422682. Its totient is φ = 168758422680.

The previous prime is 168758422667. The next prime is 168758422739. The reversal of 168758422681 is 186224857861.

It is an a-pointer prime, because the next prime (168758422739) can be obtained adding 168758422681 to its sum of digits (58).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90405455625 + 78352967056 = 300675^2 + 279916^2 .

It is a cyclic number.

It is not a de Polignac number, because 168758422681 - 2¹⁷ = 168758291609 is a prime.

It is a super-2 number, since 2×168758422681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (168758422601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84379211340 + 84379211341.

It is an arithmetic number, because the mean of its divisors is an integer number (84379211341).

Almost surely, 2^168758422681 is an apocalyptic number.

It is an amenable number.

168758422681 is a deficient number, since it is larger than the sum of its proper divisors (1).

168758422681 is an equidigital number, since it uses as much as digits as its factorization.

168758422681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10321920, while the sum is 58.

The spelling of 168758422681 in words is "one hundred sixty-eight billion, seven hundred fifty-eight million, four hundred twenty-two thousand, six hundred eighty-one".