78878363302549 has 2 divisors, whose sum is σ = 78878363302550. Its totient is φ = 78878363302548.

The previous prime is 78878363302511. The next prime is 78878363302591. The reversal of 78878363302549 is 94520336387887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55694234602449 + 23184128700100 = 7462857^2 + 4814990^2 .

It is a cyclic number.

It is not a de Polignac number, because 78878363302549 - 2¹¹ = 78878363300501 is a prime.

It is a super-2 number, since 2×78878363302549² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78878363312549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39439181651274 + 39439181651275.

It is an arithmetic number, because the mean of its divisors is an integer number (39439181651275).

Almost surely, 2^{78878363302549} is an apocalyptic number.

It is an amenable number.

78878363302549 is a deficient number, since it is larger than the sum of its proper divisors (1).

78878363302549 is an equidigital number, since it uses as much as digits as its factorization.

78878363302549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1463132160, while the sum is 73.

The spelling of 78878363302549 in words is "seventy-eight trillion, eight hundred seventy-eight billion, three hundred sixty-three million, three hundred two thousand, five hundred forty-nine".