18084286481549 has 2 divisors, whose sum is σ = 18084286481550. Its totient is φ = 18084286481548.

The previous prime is 18084286481539. The next prime is 18084286481557. The reversal of 18084286481549 is 94518468248081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15430417416649 + 2653869064900 = 3928157^2 + 1629070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18084286481549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18084286481539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9042143240774 + 9042143240775.

It is an arithmetic number, because the mean of its divisors is an integer number (9042143240775).

Almost surely, 2^{18084286481549} is an apocalyptic number.

It is an amenable number.

18084286481549 is a deficient number, since it is larger than the sum of its proper divisors (1).

18084286481549 is an equidigital number, since it uses as much as digits as its factorization.

18084286481549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141557760, while the sum is 68.

The spelling of 18084286481549 in words is "eighteen trillion, eighty-four billion, two hundred eighty-six million, four hundred eighty-one thousand, five hundred forty-nine".