78430665480121 has 2 divisors, whose sum is σ = 78430665480122. Its totient is φ = 78430665480120.

The previous prime is 78430665480107. The next prime is 78430665480149. The reversal of 78430665480121 is 12108456603487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61657217588521 + 16773447891600 = 7852211^2 + 4095540^2 .

It is an emirp because it is prime and its reverse (12108456603487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78430665480121 - 2⁹ = 78430665479609 is a prime.

It is not a weakly prime, because it can be changed into another prime (78430665480521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39215332740060 + 39215332740061.

It is an arithmetic number, because the mean of its divisors is an integer number (39215332740061).

Almost surely, 2^{78430665480121} is an apocalyptic number.

It is an amenable number.

78430665480121 is a deficient number, since it is larger than the sum of its proper divisors (1).

78430665480121 is an equidigital number, since it uses as much as digits as its factorization.

78430665480121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7741440, while the sum is 55.

The spelling of 78430665480121 in words is "seventy-eight trillion, four hundred thirty billion, six hundred sixty-five million, four hundred eighty thousand, one hundred twenty-one".