686172212352 has 192 divisors, whose sum is σ = 2165320235520. Its totient is φ = 206841600000.

The previous prime is 686172212339. The next prime is 686172212393. The reversal of 686172212352 is 253212271686.

686172212352 is a `hidden beast` number, since 6 + 8 + 617 + 2 + 2 + 1 + 23 + 5 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a junction number, because it is equal to n+sod(n) for n = 686172212298 and 686172212307.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2278602 + ... + 2562102.

It is an arithmetic number, because the mean of its divisors is an integer number (11277709560).

Almost surely, 2^686172212352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686172212352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1082660117760).

686172212352 is an abundant number, since it is smaller than the sum of its proper divisors (1479148023168).

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

686172212352 is a wasteful number, since it uses less digits than its factorization.

686172212352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283723 (or 283708 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 686172212352 in words is "six hundred eighty-six billion, one hundred seventy-two million, two hundred twelve thousand, three hundred fifty-two".