1285856226895 has 4 divisors (see below), whose sum is σ = 1543027472280. Its totient is φ = 1028684981512.

The previous prime is 1285856226799. The next prime is 1285856226901. The reversal of 1285856226895 is 5986226585821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285856226895 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1285856226895.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128585622685 + ... + 128585622694.

It is an arithmetic number, because the mean of its divisors is an integer number (385756868070).

Almost surely, 2^{1285856226895} is an apocalyptic number.

1285856226895 is a deficient number, since it is larger than the sum of its proper divisors (257171245385).

1285856226895 is an equidigital number, since it uses as much as digits as its factorization.

1285856226895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257171245384.

The product of its digits is 165888000, while the sum is 67.

The spelling of 1285856226895 in words is "one trillion, two hundred eighty-five billion, eight hundred fifty-six million, two hundred twenty-six thousand, eight hundred ninety-five".