78888910393 has 2 divisors, whose sum is σ = 78888910394. Its totient is φ = 78888910392.

The previous prime is 78888910379. The next prime is 78888910417. The reversal of 78888910393 is 39301988887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57088978489 + 21799931904 = 238933^2 + 147648^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78888910393 is a prime.

It is not a weakly prime, because it can be changed into another prime (78888910313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39444455196 + 39444455197.

It is an arithmetic number, because the mean of its divisors is an integer number (39444455197).

Almost surely, 2^78888910393 is an apocalyptic number.

It is an amenable number.

78888910393 is a deficient number, since it is larger than the sum of its proper divisors (1).

78888910393 is an equidigital number, since it uses as much as digits as its factorization.

78888910393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20901888, while the sum is 64.

The spelling of 78888910393 in words is "seventy-eight billion, eight hundred eighty-eight million, nine hundred ten thousand, three hundred ninety-three".