1856281743361 has 4 divisors (see below), whose sum is σ = 1891305927252. Its totient is φ = 1821257559472.

The previous prime is 1856281743317. The next prime is 1856281743397. The reversal of 1856281743361 is 1633471826581.

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

It can be written as a sum of positive squares in 2 ways, for example, as 451241345025 + 1405040398336 = 671745^2 + 1185344^2 .

It is a cyclic number.

It is not a de Polignac number, because 1856281743361 - 2²⁷ = 1856147525633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1856281743761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17512091866 + ... + 17512091971.

It is an arithmetic number, because the mean of its divisors is an integer number (472826481813).

Almost surely, 2^{1856281743361} is an apocalyptic number.

It is an amenable number.

1856281743361 is a deficient number, since it is larger than the sum of its proper divisors (35024183891).

1856281743361 is an equidigital number, since it uses as much as digits as its factorization.

1856281743361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35024183890.

The product of its digits is 5806080, while the sum is 55.

The spelling of 1856281743361 in words is "one trillion, eight hundred fifty-six billion, two hundred eighty-one million, seven hundred forty-three thousand, three hundred sixty-one".