1256778271348 has 12 divisors (see below), whose sum is σ = 2206868331780. Its totient is φ = 626244462272.

The previous prime is 1256778271339. The next prime is 1256778271367. The reversal of 1256778271348 is 8431728776521.

It can be written as a sum of positive squares in 2 ways, for example, as 947795708304 + 308982563044 = 973548^2 + 555862^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536167033 + ... + 536169376.

It is an arithmetic number, because the mean of its divisors is an integer number (183905694315).

Almost surely, 2^{1256778271348} is an apocalyptic number.

It is an amenable number.

1256778271348 is a deficient number, since it is larger than the sum of its proper divisors (950090060432).

1256778271348 is a wasteful number, since it uses less digits than its factorization.

1256778271348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072336706 (or 1072336704 counting only the distinct ones).

The product of its digits is 31610880, while the sum is 61.

The spelling of 1256778271348 in words is "one trillion, two hundred fifty-six billion, seven hundred seventy-eight million, two hundred seventy-one thousand, three hundred forty-eight".