1801682053781 has 2 divisors, whose sum is σ = 1801682053782. Its totient is φ = 1801682053780.

The previous prime is 1801682053739. The next prime is 1801682053837. The reversal of 1801682053781 is 1873502861081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1244630296900 + 557051756881 = 1115630^2 + 746359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1801682053781 is a prime.

It is a super-2 number, since 2×1801682053781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1801682053711) 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, 900841026890 + 900841026891.

It is an arithmetic number, because the mean of its divisors is an integer number (900841026891).

Almost surely, 2^{1801682053781} is an apocalyptic number.

It is an amenable number.

1801682053781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801682053781 is an equidigital number, since it uses as much as digits as its factorization.

1801682053781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 50.

The spelling of 1801682053781 in words is "one trillion, eight hundred one billion, six hundred eighty-two million, fifty-three thousand, seven hundred eighty-one".