67640286481 has 2 divisors, whose sum is σ = 67640286482. Its totient is φ = 67640286480.

The previous prime is 67640286397. The next prime is 67640286499. The reversal of 67640286481 is 18468204676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59931446481 + 7708840000 = 244809^2 + 87800^2 .

It is a cyclic number.

It is not a de Polignac number, because 67640286481 - 2⁷ = 67640286353 is a prime.

It is a super-2 number, since 2×67640286481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67640286781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33820143240 + 33820143241.

It is an arithmetic number, because the mean of its divisors is an integer number (33820143241).

Almost surely, 2^67640286481 is an apocalyptic number.

It is an amenable number.

67640286481 is a deficient number, since it is larger than the sum of its proper divisors (1).

67640286481 is an equidigital number, since it uses as much as digits as its factorization.

67640286481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3096576, while the sum is 52.

The spelling of 67640286481 in words is "sixty-seven billion, six hundred forty million, two hundred eighty-six thousand, four hundred eighty-one".