78699318446897 has 2 divisors, whose sum is σ = 78699318446898. Its totient is φ = 78699318446896.

The previous prime is 78699318446867. The next prime is 78699318446909. The reversal of 78699318446897 is 79864481399687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77430865869361 + 1268452577536 = 8799481^2 + 1126256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78699318446897 is a prime.

It is a super-2 number, since 2×78699318446897² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78699318446857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39349659223448 + 39349659223449.

It is an arithmetic number, because the mean of its divisors is an integer number (39349659223449).

Almost surely, 2^{78699318446897} is an apocalyptic number.

It is an amenable number.

78699318446897 is a deficient number, since it is larger than the sum of its proper divisors (1).

78699318446897 is an equidigital number, since it uses as much as digits as its factorization.

78699318446897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31603654656, while the sum is 89.

The spelling of 78699318446897 in words is "seventy-eight trillion, six hundred ninety-nine billion, three hundred eighteen million, four hundred forty-six thousand, eight hundred ninety-seven".