686564702464 has 27 divisors (see below), whose sum is σ = 1370473975227. Its totient is φ = 343275722496.

The previous prime is 686564702443. The next prime is 686564702503. The reversal of 686564702464 is 464207465686.

The square root of 686564702464 is 828592.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686564702399 and 686564702408.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13231579 + ... + 13283365.

Almost surely, 2^686564702464 is an apocalyptic number.

686564702464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

686564702464 is the 828592-nd square number.

It is an amenable number.

686564702464 is a deficient number, since it is larger than the sum of its proper divisors (683909272763).

686564702464 is an frugal number, since it uses more digits than its factorization.

686564702464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103590 (or 51789 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 58.

The spelling of 686564702464 in words is "six hundred eighty-six billion, five hundred sixty-four million, seven hundred two thousand, four hundred sixty-four".