67397816449 has 2 divisors, whose sum is σ = 67397816450. Its totient is φ = 67397816448.

The previous prime is 67397816401. The next prime is 67397816471. The reversal of 67397816449 is 94461879376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46889571600 + 20508244849 = 216540^2 + 143207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67397816449 is a prime.

It is not a weakly prime, because it can be changed into another prime (67397816489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33698908224 + 33698908225.

It is an arithmetic number, because the mean of its divisors is an integer number (33698908225).

Almost surely, 2^67397816449 is an apocalyptic number.

It is an amenable number.

67397816449 is a deficient number, since it is larger than the sum of its proper divisors (1).

67397816449 is an equidigital number, since it uses as much as digits as its factorization.

67397816449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54867456, while the sum is 64.

The spelling of 67397816449 in words is "sixty-seven billion, three hundred ninety-seven million, eight hundred sixteen thousand, four hundred forty-nine".