1280478019277 has 2 divisors, whose sum is σ = 1280478019278. Its totient is φ = 1280478019276.

The previous prime is 1280478019273. The next prime is 1280478019367. The reversal of 1280478019277 is 7729108740821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1229679170281 + 50798848996 = 1108909^2 + 225386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280478019277 - 2² = 1280478019273 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280478019273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640239009638 + 640239009639.

It is an arithmetic number, because the mean of its divisors is an integer number (640239009639).

Almost surely, 2^{1280478019277} is an apocalyptic number.

It is an amenable number.

1280478019277 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280478019277 is an equidigital number, since it uses as much as digits as its factorization.

1280478019277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3161088, while the sum is 56.

The spelling of 1280478019277 in words is "one trillion, two hundred eighty billion, four hundred seventy-eight million, nineteen thousand, two hundred seventy-seven".