521718858412 has 12 divisors (see below), whose sum is σ = 913202168256. Its totient is φ = 260803953200.

The previous prime is 521718858371. The next prime is 521718858413. The reversal of 521718858412 is 214858817125.

It is a self number, because there is not a number n which added to its sum of digits gives 521718858412.

It is not an unprimeable number, because it can be changed into a prime (521718858413) 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, 13847839 + ... + 13885462.

It is an arithmetic number, because the mean of its divisors is an integer number (76100180688).

Almost surely, 2^521718858412 is an apocalyptic number.

It is an amenable number.

521718858412 is a deficient number, since it is larger than the sum of its proper divisors (391483309844).

521718858412 is a wasteful number, since it uses less digits than its factorization.

521718858412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27738008 (or 27738006 counting only the distinct ones).

The product of its digits is 1433600, while the sum is 52.

The spelling of 521718858412 in words is "five hundred twenty-one billion, seven hundred eighteen million, eight hundred fifty-eight thousand, four hundred twelve".