78878363302177 has 2 divisors, whose sum is σ = 78878363302178. Its totient is φ = 78878363302176.

The previous prime is 78878363302043. The next prime is 78878363302213. The reversal of 78878363302177 is 77120336387887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61285741047441 + 17592622254736 = 7828521^2 + 4194356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78878363302177 is a prime.

It is not a weakly prime, because it can be changed into another prime (78878363302877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39439181651088 + 39439181651089.

It is an arithmetic number, because the mean of its divisors is an integer number (39439181651089).

Almost surely, 2^{78878363302177} is an apocalyptic number.

It is an amenable number.

78878363302177 is a deficient number, since it is larger than the sum of its proper divisors (1).

78878363302177 is an equidigital number, since it uses as much as digits as its factorization.

78878363302177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 398297088, while the sum is 70.

The spelling of 78878363302177 in words is "seventy-eight trillion, eight hundred seventy-eight billion, three hundred sixty-three million, three hundred two thousand, one hundred seventy-seven".