67420929281 has 2 divisors, whose sum is σ = 67420929282. Its totient is φ = 67420929280.

The previous prime is 67420929239. The next prime is 67420929311. The reversal of 67420929281 is 18292902476.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42236826256 + 25184103025 = 205516^2 + 158695^2 .

It is a cyclic number.

It is not a de Polignac number, because 67420929281 - 2¹⁸ = 67420667137 is a prime.

It is a super-2 number, since 2×67420929281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67420929481) 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, 33710464640 + 33710464641.

It is an arithmetic number, because the mean of its divisors is an integer number (33710464641).

Almost surely, 2^67420929281 is an apocalyptic number.

It is an amenable number.

67420929281 is a deficient number, since it is larger than the sum of its proper divisors (1).

67420929281 is an equidigital number, since it uses as much as digits as its factorization.

67420929281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 67420929281 in words is "sixty-seven billion, four hundred twenty million, nine hundred twenty-nine thousand, two hundred eighty-one".