18274247281 has 2 divisors, whose sum is σ = 18274247282. Its totient is φ = 18274247280.

The previous prime is 18274247273. The next prime is 18274247353.

18274247281 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17424000000 + 850247281 = 132000^2 + 29159^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 18274247281 - 2³ = 18274247273 is a prime.

It is a super-2 number, since 2×18274247281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18274247581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9137123640 + 9137123641.

It is an arithmetic number, because the mean of its divisors is an integer number (9137123641).

Almost surely, 2^18274247281 is an apocalyptic number.

It is an amenable number.

18274247281 is a deficient number, since it is larger than the sum of its proper divisors (1).

18274247281 is an equidigital number, since it uses as much as digits as its factorization.

18274247281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 401408, while the sum is 46.

The spelling of 18274247281 in words is "eighteen billion, two hundred seventy-four million, two hundred forty-seven thousand, two hundred eighty-one".