78470071993 has 2 divisors, whose sum is σ = 78470071994. Its totient is φ = 78470071992.

The previous prime is 78470071949. The next prime is 78470071997. The reversal of 78470071993 is 39917007487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66021760809 + 12448311184 = 256947^2 + 111572^2 .

It is a cyclic number.

It is not a de Polignac number, because 78470071993 - 2⁹ = 78470071481 is a prime.

It is not a weakly prime, because it can be changed into another prime (78470071997) 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, 39235035996 + 39235035997.

It is an arithmetic number, because the mean of its divisors is an integer number (39235035997).

Almost surely, 2^78470071993 is an apocalyptic number.

It is an amenable number.

78470071993 is a deficient number, since it is larger than the sum of its proper divisors (1).

78470071993 is an equidigital number, since it uses as much as digits as its factorization.

78470071993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 78470071993 in words is "seventy-eight billion, four hundred seventy million, seventy-one thousand, nine hundred ninety-three".