686005445957706 has 72 divisors (see below), whose sum is σ = 1729387900718244. Its totient is φ = 195959139425280.

The previous prime is 686005445957609. The next prime is 686005445957809. The reversal of 686005445957706 is 607759544500686.

686005445957706 is a `hidden beast` number, since 6 + 8 + 6 + 0 + 0 + 5 + 4 + 45 + 9 + 577 + 0 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 653455465700625 + 32549980257081 = 25562775^2 + 5705259^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 80081815 + ... + 88233258.

Almost surely, 2^{686005445957706} is an apocalyptic number.

686005445957706 is an abundant number, since it is smaller than the sum of its proper divisors (1043382454760538).

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

686005445957706 is a wasteful number, since it uses less digits than its factorization.

686005445957706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168319716 (or 168319706 counting only the distinct ones).

The product of its (nonzero) digits is 1524096000, while the sum is 72.

The spelling of 686005445957706 in words is "six hundred eighty-six trillion, five billion, four hundred forty-five million, nine hundred fifty-seven thousand, seven hundred six".