18281838368 has 12 divisors (see below), whose sum is σ = 35992369350. Its totient is φ = 9140919168.

The previous prime is 18281838317. The next prime is 18281838383. The reversal of 18281838368 is 86383818281.

It can be written as a sum of positive squares in only one way, i.e., 14441309584 + 3840528784 = 120172^2 + 61972^2 .

It is a super-2 number, since 2×18281838368² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 285653693 + ... + 285653756.

Almost surely, 2^18281838368 is an apocalyptic number.

It is an amenable number.

18281838368 is a deficient number, since it is larger than the sum of its proper divisors (17710530982).

18281838368 is an equidigital number, since it uses as much as digits as its factorization.

18281838368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571307459 (or 571307451 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 56.

The spelling of 18281838368 in words is "eighteen billion, two hundred eighty-one million, eight hundred thirty-eight thousand, three hundred sixty-eight".