78558034249 has 2 divisors, whose sum is σ = 78558034250. Its totient is φ = 78558034248.

The previous prime is 78558034237. The next prime is 78558034283. The reversal of 78558034249 is 94243085587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68660769024 + 9897265225 = 262032^2 + 99485^2 .

It is a cyclic number.

It is not a de Polignac number, because 78558034249 - 2²³ = 78549645641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78558034249.

It is not a weakly prime, because it can be changed into another prime (78558034949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39279017124 + 39279017125.

It is an arithmetic number, because the mean of its divisors is an integer number (39279017125).

Almost surely, 2^78558034249 is an apocalyptic number.

It is an amenable number.

78558034249 is a deficient number, since it is larger than the sum of its proper divisors (1).

78558034249 is an equidigital number, since it uses as much as digits as its factorization.

78558034249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9676800, while the sum is 55.

The spelling of 78558034249 in words is "seventy-eight billion, five hundred fifty-eight million, thirty-four thousand, two hundred forty-nine".