518713688340 has 72 divisors (see below), whose sum is σ = 1576049872488. Its totient is φ = 138093465600.

The previous prime is 518713688327. The next prime is 518713688347. The reversal of 518713688340 is 43886317815.

It is a happy number.

518713688340 is a `hidden beast` number, since 518 + 7 + 1 + 3 + 6 + 8 + 83 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 298942123536 + 219771564804 = 546756^2 + 468798^2 .

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518713688347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2289277 + ... + 2505636.

Almost surely, 2^518713688340 is an apocalyptic number.

It is an amenable number.

518713688340 is an abundant number, since it is smaller than the sum of its proper divisors (1057336184148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

518713688340 is a wasteful number, since it uses less digits than its factorization.

518713688340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795529 (or 4795524 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 518713688340 in words is "five hundred eighteen billion, seven hundred thirteen million, six hundred eighty-eight thousand, three hundred forty".