67778345353 has 2 divisors, whose sum is σ = 67778345354. Its totient is φ = 67778345352.

The previous prime is 67778345351. The next prime is 67778345387. The reversal of 67778345353 is 35354387776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53857413184 + 13920932169 = 232072^2 + 117987^2 .

It is a cyclic number.

It is not a de Polignac number, because 67778345353 - 2¹ = 67778345351 is a prime.

Together with 67778345351, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (67778345351) 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, 33889172676 + 33889172677.

It is an arithmetic number, because the mean of its divisors is an integer number (33889172677).

Almost surely, 2^67778345353 is an apocalyptic number.

It is an amenable number.

67778345353 is a deficient number, since it is larger than the sum of its proper divisors (1).

67778345353 is an equidigital number, since it uses as much as digits as its factorization.

67778345353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44452800, while the sum is 58.

The spelling of 67778345353 in words is "sixty-seven billion, seven hundred seventy-eight million, three hundred forty-five thousand, three hundred fifty-three".