1838846981681 has 2 divisors, whose sum is σ = 1838846981682. Its totient is φ = 1838846981680.

The previous prime is 1838846981591. The next prime is 1838846981711. The reversal of 1838846981681 is 1861896488381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1724386559281 + 114460422400 = 1313159^2 + 338320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1838846981681 is a prime.

It is a super-2 number, since 2×1838846981681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1838846981581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 919423490840 + 919423490841.

It is an arithmetic number, because the mean of its divisors is an integer number (919423490841).

Almost surely, 2^{1838846981681} is an apocalyptic number.

It is an amenable number.

1838846981681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1838846981681 is an equidigital number, since it uses as much as digits as its factorization.

1838846981681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127401984, while the sum is 71.

The spelling of 1838846981681 in words is "one trillion, eight hundred thirty-eight billion, eight hundred forty-six million, nine hundred eighty-one thousand, six hundred eighty-one".