1278536775379 has 2 divisors, whose sum is σ = 1278536775380. Its totient is φ = 1278536775378.

The previous prime is 1278536775343. The next prime is 1278536775391. The reversal of 1278536775379 is 9735776358721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1278536775379 - 2¹³ = 1278536767187 is a prime.

It is a super-3 number, since 3×1278536775379³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1278536775479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639268387689 + 639268387690.

It is an arithmetic number, because the mean of its divisors is an integer number (639268387690).

Almost surely, 2^{1278536775379} is an apocalyptic number.

1278536775379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278536775379 is an equidigital number, since it uses as much as digits as its factorization.

1278536775379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466754400, while the sum is 70.

The spelling of 1278536775379 in words is "one trillion, two hundred seventy-eight billion, five hundred thirty-six million, seven hundred seventy-five thousand, three hundred seventy-nine".