686259814464 has 189 divisors, whose sum is σ = 2288653349151. Its totient is φ = 196034469120.

The previous prime is 686259814459. The next prime is 686259814517. The reversal of 686259814464 is 464418952686.

The square root of 686259814464 is 828408.

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

686259814464 is a `hidden beast` number, since 6 + 8 + 62 + 59 + 81 + 446 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 139170079 + ... + 139175009.

Almost surely, 2^686259814464 is an apocalyptic number.

686259814464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

686259814464 is the 828408-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686259814464

686259814464 is an abundant number, since it is smaller than the sum of its proper divisors (1602393534687).

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

686259814464 is an frugal number, since it uses more digits than its factorization.

686259814464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9894 (or 4943 counting only the distinct ones).

The product of its digits is 79626240, while the sum is 63.

The spelling of 686259814464 in words is "six hundred eighty-six billion, two hundred fifty-nine million, eight hundred fourteen thousand, four hundred sixty-four".