518494668 has 12 divisors (see below), whose sum is σ = 1209820920. Its totient is φ = 172831552.

The previous prime is 518494663. The next prime is 518494703. The reversal of 518494668 is 866494815.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 518494668.

It is not an unprimeable number, because it can be changed into a prime (518494661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21603933 + ... + 21603956.

It is an arithmetic number, because the mean of its divisors is an integer number (100818410).

Almost surely, 2^518494668 is an apocalyptic number.

It is an amenable number.

518494668 is an abundant number, since it is smaller than the sum of its proper divisors (691326252).

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

518494668 is a wasteful number, since it uses less digits than its factorization.

518494668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43207896 (or 43207894 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 51.

The square root of 518494668 is about 22770.4779923479. The cubic root of 518494668 is about 803.3684367199.

The spelling of 518494668 in words is "five hundred eighteen million, four hundred ninety-four thousand, six hundred sixty-eight".