168591680731 has 2 divisors, whose sum is σ = 168591680732. Its totient is φ = 168591680730.

The previous prime is 168591680729. The next prime is 168591680759. The reversal of 168591680731 is 137086195861.

It is a happy number.

168591680731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168591680731 - 2¹ = 168591680729 is a prime.

It is a super-2 number, since 2×168591680731² (a number of 23 digits) contains 22 as substring.

Together with 168591680729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (168591680711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84295840365 + 84295840366.

It is an arithmetic number, because the mean of its divisors is an integer number (84295840366).

Almost surely, 2^168591680731 is an apocalyptic number.

168591680731 is a deficient number, since it is larger than the sum of its proper divisors (1).

168591680731 is an equidigital number, since it uses as much as digits as its factorization.

168591680731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 168591680731 in words is "one hundred sixty-eight billion, five hundred ninety-one million, six hundred eighty thousand, seven hundred thirty-one".