1256457812975 has 12 divisors (see below), whose sum is σ = 1562421318576. Its totient is φ = 1002318746880.

The previous prime is 1256457812969. The next prime is 1256457813011. The reversal of 1256457812975 is 5792187546521.

It is not a de Polignac number, because 1256457812975 - 2⁴ = 1256457812959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71178587 + ... + 71196236.

It is an arithmetic number, because the mean of its divisors is an integer number (130201776548).

Almost surely, 2^{1256457812975} is an apocalyptic number.

1256457812975 is a deficient number, since it is larger than the sum of its proper divisors (305963505601).

1256457812975 is a wasteful number, since it uses less digits than its factorization.

1256457812975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142375186 (or 142375181 counting only the distinct ones).

The product of its digits is 42336000, while the sum is 62.

The spelling of 1256457812975 in words is "one trillion, two hundred fifty-six billion, four hundred fifty-seven million, eight hundred twelve thousand, nine hundred seventy-five".