518491347840 has 768 divisors, whose sum is σ = 1910967552000. Its totient is φ = 129266565120.

The previous prime is 518491347839. The next prime is 518491347853. The reversal of 518491347840 is 48743194815.

518491347840 is a `hidden beast` number, since 5 + 1 + 84 + 91 + 3 + 478 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 1871809782 + ... + 1871810058.

It is an arithmetic number, because the mean of its divisors is an integer number (2488239000).

Almost surely, 2^518491347840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 518491347840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (955483776000).

518491347840 is an abundant number, since it is smaller than the sum of its proper divisors (1392476204160).

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

518491347840 is a wasteful number, since it uses less digits than its factorization.

518491347840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595 (or 580 counting only the distinct ones).

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

The spelling of 518491347840 in words is "five hundred eighteen billion, four hundred ninety-one million, three hundred forty-seven thousand, eight hundred forty".