18435549281 has 2 divisors, whose sum is σ = 18435549282. Its totient is φ = 18435549280.

The previous prime is 18435549277. The next prime is 18435549287. The reversal of 18435549281 is 18294553481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18337222225 + 98327056 = 135415^2 + 9916^2 .

It is a cyclic number.

It is not a de Polignac number, because 18435549281 - 2² = 18435549277 is a prime.

It is a super-2 number, since 2×18435549281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18435549287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9217774640 + 9217774641.

It is an arithmetic number, because the mean of its divisors is an integer number (9217774641).

Almost surely, 2^18435549281 is an apocalyptic number.

It is an amenable number.

18435549281 is a deficient number, since it is larger than the sum of its proper divisors (1).

18435549281 is an equidigital number, since it uses as much as digits as its factorization.

18435549281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382400, while the sum is 50.

The spelling of 18435549281 in words is "eighteen billion, four hundred thirty-five million, five hundred forty-nine thousand, two hundred eighty-one".