78966794649601 has 2 divisors, whose sum is σ = 78966794649602. Its totient is φ = 78966794649600.

The previous prime is 78966794649593. The next prime is 78966794649679. The reversal of 78966794649601 is 10694649766987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69101064417025 + 9865730232576 = 8312705^2 + 3140976^2 .

It is a cyclic number.

It is not a de Polignac number, because 78966794649601 - 2³ = 78966794649593 is a prime.

It is not a weakly prime, because it can be changed into another prime (78966794649401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39483397324800 + 39483397324801.

It is an arithmetic number, because the mean of its divisors is an integer number (39483397324801).

Almost surely, 2^{78966794649601} is an apocalyptic number.

It is an amenable number.

78966794649601 is a deficient number, since it is larger than the sum of its proper divisors (1).

78966794649601 is an equidigital number, since it uses as much as digits as its factorization.

78966794649601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5925685248, while the sum is 82.

The spelling of 78966794649601 in words is "seventy-eight trillion, nine hundred sixty-six billion, seven hundred ninety-four million, six hundred forty-nine thousand, six hundred one".