518231533689 has 15 divisors (see below), whose sum is σ = 774158018997. Its totient is φ = 345483369828.

The previous prime is 518231533681. The next prime is 518231533691. The reversal of 518231533689 is 986335132815.

The square root of 518231533689 is 719883.

It is a perfect power (a square), and thus also a powerful number.

518231533689 is a `hidden beast` number, since 5 + 1 + 8 + 23 + 1 + 533 + 6 + 89 = 666.

It is not a de Polignac number, because 518231533689 - 2³ = 518231533681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (518231533681) 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 14 ways as a sum of consecutive naturals, for example, 6438954 + ... + 6518940.

Almost surely, 2^518231533689 is an apocalyptic number.

518231533689 is the 719883-rd square number.

518231533689 is the 359942-nd centered octagonal number.

It is an amenable number.

518231533689 is a deficient number, since it is larger than the sum of its proper divisors (255926485308).

518231533689 is an frugal number, since it uses more digits than its factorization.

518231533689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159986 (or 79990 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The spelling of 518231533689 in words is "five hundred eighteen billion, two hundred thirty-one million, five hundred thirty-three thousand, six hundred eighty-nine".