128248786708457 has 2 divisors, whose sum is σ = 128248786708458. Its totient is φ = 128248786708456.

The previous prime is 128248786708423. The next prime is 128248786708487. The reversal of 128248786708457 is 754807687842821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68483966454016 + 59764820254441 = 8275504^2 + 7730771^2 .

It is an emirp because it is prime and its reverse (754807687842821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128248786708457 - 2²⁶ = 128248719599593 is a prime.

It is not a weakly prime, because it can be changed into another prime (128248786708487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64124393354228 + 64124393354229.

It is an arithmetic number, because the mean of its divisors is an integer number (64124393354229).

Almost surely, 2^{128248786708457} is an apocalyptic number.

It is an amenable number.

128248786708457 is a deficient number, since it is larger than the sum of its proper divisors (1).

128248786708457 is an equidigital number, since it uses as much as digits as its factorization.

128248786708457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2697461760, while the sum is 77.

The spelling of 128248786708457 in words is "one hundred twenty-eight trillion, two hundred forty-eight billion, seven hundred eighty-six million, seven hundred eight thousand, four hundred fifty-seven".