18084286481557 has 2 divisors, whose sum is σ = 18084286481558. Its totient is φ = 18084286481556.

The previous prime is 18084286481549. The next prime is 18084286481609. The reversal of 18084286481557 is 75518468248081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17632936307281 + 451350174276 = 4199159^2 + 671826^2 .

It is a cyclic number.

It is not a de Polignac number, because 18084286481557 - 2³ = 18084286481549 is a prime.

It is a super-2 number, since 2×18084286481557² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18084286481492 and 18084286481501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18084286481357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9042143240778 + 9042143240779.

It is an arithmetic number, because the mean of its divisors is an integer number (9042143240779).

Almost surely, 2^{18084286481557} is an apocalyptic number.

It is an amenable number.

18084286481557 is a deficient number, since it is larger than the sum of its proper divisors (1).

18084286481557 is an equidigital number, since it uses as much as digits as its factorization.

18084286481557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137625600, while the sum is 67.

The spelling of 18084286481557 in words is "eighteen trillion, eighty-four billion, two hundred eighty-six million, four hundred eighty-one thousand, five hundred fifty-seven".