1856241138643 has 2 divisors, whose sum is σ = 1856241138644. Its totient is φ = 1856241138642.

The previous prime is 1856241138637. The next prime is 1856241138667. The reversal of 1856241138643 is 3468311426581.

It is a weak prime.

It is an emirp because it is prime and its reverse (3468311426581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1856241138643 - 2⁵ = 1856241138611 is a prime.

It is a super-2 number, since 2×1856241138643² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1856241138673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 928120569321 + 928120569322.

It is an arithmetic number, because the mean of its divisors is an integer number (928120569322).

Almost surely, 2^{1856241138643} is an apocalyptic number.

1856241138643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1856241138643 is an equidigital number, since it uses as much as digits as its factorization.

1856241138643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3317760, while the sum is 52.

The spelling of 1856241138643 in words is "one trillion, eight hundred fifty-six billion, two hundred forty-one million, one hundred thirty-eight thousand, six hundred forty-three".