78148471450729 has 2 divisors, whose sum is σ = 78148471450730. Its totient is φ = 78148471450728.

The previous prime is 78148471450717. The next prime is 78148471450811. The reversal of 78148471450729 is 92705417484187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60476705162329 + 17671766288400 = 7776677^2 + 4203780^2 .

It is a cyclic number.

It is not a de Polignac number, because 78148471450729 - 2¹⁹ = 78148470926441 is a prime.

It is a super-2 number, since 2×78148471450729² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78148471750729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39074235725364 + 39074235725365.

It is an arithmetic number, because the mean of its divisors is an integer number (39074235725365).

Almost surely, 2^{78148471450729} is an apocalyptic number.

It is an amenable number.

78148471450729 is a deficient number, since it is larger than the sum of its proper divisors (1).

78148471450729 is an equidigital number, since it uses as much as digits as its factorization.

78148471450729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126443520, while the sum is 67.

The spelling of 78148471450729 in words is "seventy-eight trillion, one hundred forty-eight billion, four hundred seventy-one million, four hundred fifty thousand, seven hundred twenty-nine".