1285856226779 has 2 divisors, whose sum is σ = 1285856226780. Its totient is φ = 1285856226778.

The previous prime is 1285856226769. The next prime is 1285856226799. The reversal of 1285856226779 is 9776226585821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1285856226779 - 2⁴ = 1285856226763 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1285856226769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642928113389 + 642928113390.

It is an arithmetic number, because the mean of its divisors is an integer number (642928113390).

Almost surely, 2^{1285856226779} is an apocalyptic number.

1285856226779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285856226779 is an equidigital number, since it uses as much as digits as its factorization.

1285856226779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 203212800, while the sum is 68.

The spelling of 1285856226779 in words is "one trillion, two hundred eighty-five billion, eight hundred fifty-six million, two hundred twenty-six thousand, seven hundred seventy-nine".