8518663681 has 8 divisors (see below), whose sum is σ = 9299932128. Its totient is φ = 7738536000.

The previous prime is 8518663633. The next prime is 8518663697. The reversal of 8518663681 is 1863668158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8518663681 - 2¹¹ = 8518661633 is a prime.

It is a super-2 number, since 2×8518663681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8518663381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269535 + ... + 299476.

It is an arithmetic number, because the mean of its divisors is an integer number (1162491516).

Almost surely, 2^8518663681 is an apocalyptic number.

It is an amenable number.

8518663681 is a deficient number, since it is larger than the sum of its proper divisors (781268447).

8518663681 is a wasteful number, since it uses less digits than its factorization.

8518663681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570383.

The product of its digits is 1658880, while the sum is 52.

The square root of 8518663681 is about 92296.6070936521. The cubic root of 8518663681 is about 2042.3201592097.

The spelling of 8518663681 in words is "eight billion, five hundred eighteen million, six hundred sixty-three thousand, six hundred eighty-one".