78088851017 has 2 divisors, whose sum is σ = 78088851018. Its totient is φ = 78088851016.

The previous prime is 78088850999. The next prime is 78088851047. The reversal of 78088851017 is 71015888087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39548879161 + 38539971856 = 198869^2 + 196316^2 .

It is a cyclic number.

It is not a de Polignac number, because 78088851017 - 2¹⁴ = 78088834633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78088851017.

It is not a weakly prime, because it can be changed into another prime (78088851047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39044425508 + 39044425509.

It is an arithmetic number, because the mean of its divisors is an integer number (39044425509).

Almost surely, 2^78088851017 is an apocalyptic number.

It is an amenable number.

78088851017 is a deficient number, since it is larger than the sum of its proper divisors (1).

78088851017 is an equidigital number, since it uses as much as digits as its factorization.

78088851017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1003520, while the sum is 53.

The spelling of 78088851017 in words is "seventy-eight billion, eighty-eight million, eight hundred fifty-one thousand, seventeen".