67716307657 has 2 divisors, whose sum is σ = 67716307658. Its totient is φ = 67716307656.

The previous prime is 67716307643. The next prime is 67716307709. The reversal of 67716307657 is 75670361776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66607351056 + 1108956601 = 258084^2 + 33301^2 .

It is a cyclic number.

It is not a de Polignac number, because 67716307657 - 2¹⁵ = 67716274889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67716307598 and 67716307607.

It is not a weakly prime, because it can be changed into another prime (67716307627) 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, 33858153828 + 33858153829.

It is an arithmetic number, because the mean of its divisors is an integer number (33858153829).

Almost surely, 2^67716307657 is an apocalyptic number.

It is an amenable number.

67716307657 is a deficient number, since it is larger than the sum of its proper divisors (1).

67716307657 is an equidigital number, since it uses as much as digits as its factorization.

67716307657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7779240, while the sum is 55.

The spelling of 67716307657 in words is "sixty-seven billion, seven hundred sixteen million, three hundred seven thousand, six hundred fifty-seven".