681764457167 has 2 divisors, whose sum is σ = 681764457168. Its totient is φ = 681764457166.

The previous prime is 681764457161. The next prime is 681764457191. The reversal of 681764457167 is 761754467186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681764457167 - 2³⁴ = 664584587983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681764457161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340882228583 + 340882228584.

It is an arithmetic number, because the mean of its divisors is an integer number (340882228584).

Almost surely, 2^681764457167 is an apocalyptic number.

681764457167 is a deficient number, since it is larger than the sum of its proper divisors (1).

681764457167 is an equidigital number, since it uses as much as digits as its factorization.

681764457167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47416320, while the sum is 62.

The spelling of 681764457167 in words is "six hundred eighty-one billion, seven hundred sixty-four million, four hundred fifty-seven thousand, one hundred sixty-seven".