78817870686067 has 2 divisors, whose sum is σ = 78817870686068. Its totient is φ = 78817870686066.

The previous prime is 78817870686053. The next prime is 78817870686083. The reversal of 78817870686067 is 76068607871887.

It is a weak prime.

It is an emirp because it is prime and its reverse (76068607871887) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78817870686067 is a prime.

It is not a weakly prime, because it can be changed into another prime (78817870686017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39408935343033 + 39408935343034.

It is an arithmetic number, because the mean of its divisors is an integer number (39408935343034).

Almost surely, 2^{78817870686067} is an apocalyptic number.

78817870686067 is a deficient number, since it is larger than the sum of its proper divisors (1).

78817870686067 is an equidigital number, since it uses as much as digits as its factorization.

78817870686067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2124251136, while the sum is 79.

The spelling of 78817870686067 in words is "seventy-eight trillion, eight hundred seventeen billion, eight hundred seventy million, six hundred eighty-six thousand, sixty-seven".