1285856226799 has 2 divisors, whose sum is σ = 1285856226800. Its totient is φ = 1285856226798.

The previous prime is 1285856226779. The next prime is 1285856226901. The reversal of 1285856226799 is 9976226585821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1285856226799 - 2¹³ = 1285856218607 is a prime.

It is a super-3 number, since 3×1285856226799³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

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, 642928113399 + 642928113400.

It is an arithmetic number, because the mean of its divisors is an integer number (642928113400).

Almost surely, 2^{1285856226799} is an apocalyptic number.

1285856226799 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285856226799 is an equidigital number, since it uses as much as digits as its factorization.

1285856226799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 261273600, while the sum is 70.

The spelling of 1285856226799 in words is "one trillion, two hundred eighty-five billion, eight hundred fifty-six million, two hundred twenty-six thousand, seven hundred ninety-nine".