67534068821 has 2 divisors, whose sum is σ = 67534068822. Its totient is φ = 67534068820.

The previous prime is 67534068677. The next prime is 67534068869. The reversal of 67534068821 is 12886043576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35038598596 + 32495470225 = 187186^2 + 180265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67534068821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 67534068821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67534068221) 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, 33767034410 + 33767034411.

It is an arithmetic number, because the mean of its divisors is an integer number (33767034411).

Almost surely, 2^67534068821 is an apocalyptic number.

It is an amenable number.

67534068821 is a deficient number, since it is larger than the sum of its proper divisors (1).

67534068821 is an equidigital number, since it uses as much as digits as its factorization.

67534068821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 67534068821 in words is "sixty-seven billion, five hundred thirty-four million, sixty-eight thousand, eight hundred twenty-one".