1285865824386 has 64 divisors (see below), whose sum is σ = 3030988544640. Its totient is φ = 358533527040.

The previous prime is 1285865824301. The next prime is 1285865824387. The reversal of 1285865824386 is 6834285685821.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (1285865824387) 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 31 ways as a sum of consecutive naturals, for example, 2125501 + ... + 2662608.

It is an arithmetic number, because the mean of its divisors is an integer number (47359196010).

Almost surely, 2^{1285865824386} is an apocalyptic number.

1285865824386 is an abundant number, since it is smaller than the sum of its proper divisors (1745122720254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1285865824386 is a wasteful number, since it uses less digits than its factorization.

1285865824386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4788451.

The product of its digits is 176947200, while the sum is 66.

The spelling of 1285865824386 in words is "one trillion, two hundred eighty-five billion, eight hundred sixty-five million, eight hundred twenty-four thousand, three hundred eighty-six".