1285021781793 has 12 divisors (see below), whose sum is σ = 1883846195088. Its totient is φ = 843894901080.

The previous prime is 1285021781777. The next prime is 1285021781863. The reversal of 1285021781793 is 3971871205821.

1285021781793 is a `hidden beast` number, since 1 + 28 + 502 + 17 + 8 + 17 + 93 = 666.

It is not a de Polignac number, because 1285021781793 - 2⁴ = 1285021781777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1285021781753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1065523263 + ... + 1065524468.

It is an arithmetic number, because the mean of its divisors is an integer number (156987182924).

Almost surely, 2^{1285021781793} is an apocalyptic number.

It is an amenable number.

1285021781793 is a deficient number, since it is larger than the sum of its proper divisors (598824413295).

1285021781793 is a wasteful number, since it uses less digits than its factorization.

1285021781793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131047804 (or 2131047801 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 54.

The spelling of 1285021781793 in words is "one trillion, two hundred eighty-five billion, twenty-one million, seven hundred eighty-one thousand, seven hundred ninety-three".