718439321664 has 63 divisors (see below), whose sum is σ = 2059334907357. Its totient is φ = 239472993024.

The previous prime is 718439321651. The next prime is 718439321683. The reversal of 718439321664 is 466123934817.

The square root of 718439321664 is 847608.

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

718439321664 is a `hidden beast` number, since 7 + 18 + 439 + 32 + 166 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 366799809600 + 351639512064 = 605640^2 + 592992^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 718439321664.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20324934 + ... + 20360250.

Almost surely, 2^718439321664 is an apocalyptic number.

718439321664 is the 847608-th square number.

It is an amenable number.

718439321664 is an abundant number, since it is smaller than the sum of its proper divisors (1340895585693).

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

718439321664 is an frugal number, since it uses more digits than its factorization.

718439321664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70652 (or 35322 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 718439321664 in words is "seven hundred eighteen billion, four hundred thirty-nine million, three hundred twenty-one thousand, six hundred sixty-four".