1256881375625 has 10 divisors (see below), whose sum is σ = 1570598967762. Its totient is φ = 1005505100000.

The previous prime is 1256881375609. The next prime is 1256881375627. The reversal of 1256881375625 is 5265731886521.

It can be written as a sum of positive squares in 5 ways, for example, as 526791446416 + 730089929209 = 725804^2 + 854453^2 .

It is not a de Polignac number, because 1256881375625 - 2⁴ = 1256881375609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1256881375627) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1005504476 + ... + 1005505725.

Almost surely, 2^{1256881375625} is an apocalyptic number.

It is an amenable number.

1256881375625 is a deficient number, since it is larger than the sum of its proper divisors (313717592137).

1256881375625 is an frugal number, since it uses more digits than its factorization.

1256881375625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011010221 (or 2011010206 counting only the distinct ones).

The product of its digits is 24192000, while the sum is 59.

The spelling of 1256881375625 in words is "one trillion, two hundred fifty-six billion, eight hundred eighty-one million, three hundred seventy-five thousand, six hundred twenty-five".