1256788995851 has 2 divisors, whose sum is σ = 1256788995852. Its totient is φ = 1256788995850.

The previous prime is 1256788995829. The next prime is 1256788995887. The reversal of 1256788995851 is 1585998876521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256788995851 - 2¹⁰ = 1256788994827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256788995151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628394497925 + 628394497926.

It is an arithmetic number, because the mean of its divisors is an integer number (628394497926).

Almost surely, 2^{1256788995851} is an apocalyptic number.

1256788995851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256788995851 is an equidigital number, since it uses as much as digits as its factorization.

1256788995851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456000, while the sum is 74.

The spelling of 1256788995851 in words is "one trillion, two hundred fifty-six billion, seven hundred eighty-eight million, nine hundred ninety-five thousand, eight hundred fifty-one".