78480657257 has 2 divisors, whose sum is σ = 78480657258. Its totient is φ = 78480657256.

The previous prime is 78480657251. The next prime is 78480657263. The reversal of 78480657257 is 75275608487.

It is a balanced prime because it is at equal distance from previous prime (78480657251) and next prime (78480657263).

It can be written as a sum of positive squares in only one way, i.e., 70775153296 + 7705503961 = 266036^2 + 87781^2 .

It is a cyclic number.

It is not a de Polignac number, because 78480657257 - 2⁸ = 78480657001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78480657196 and 78480657205.

It is not a weakly prime, because it can be changed into another prime (78480657251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39240328628 + 39240328629.

It is an arithmetic number, because the mean of its divisors is an integer number (39240328629).

Almost surely, 2^78480657257 is an apocalyptic number.

It is an amenable number.

78480657257 is a deficient number, since it is larger than the sum of its proper divisors (1).

78480657257 is an equidigital number, since it uses as much as digits as its factorization.

78480657257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26342400, while the sum is 59.

The spelling of 78480657257 in words is "seventy-eight billion, four hundred eighty million, six hundred fifty-seven thousand, two hundred fifty-seven".