168580689365749 has 2 divisors, whose sum is σ = 168580689365750. Its totient is φ = 168580689365748.

The previous prime is 168580689365747. The next prime is 168580689365779. The reversal of 168580689365749 is 947563986085861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111319232928849 + 57261456436900 = 10550793^2 + 7567130^2 .

It is a cyclic number.

It is not a de Polignac number, because 168580689365749 - 2¹ = 168580689365747 is a prime.

Together with 168580689365747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168580689365741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84290344682874 + 84290344682875.

It is an arithmetic number, because the mean of its divisors is an integer number (84290344682875).

Almost surely, 2^{168580689365749} is an apocalyptic number.

It is an amenable number.

168580689365749 is a deficient number, since it is larger than the sum of its proper divisors (1).

168580689365749 is an equidigital number, since it uses as much as digits as its factorization.

168580689365749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18811699200, while the sum is 85.

The spelling of 168580689365749 in words is "one hundred sixty-eight trillion, five hundred eighty billion, six hundred eighty-nine million, three hundred sixty-five thousand, seven hundred forty-nine".