686820067540 has 12 divisors (see below), whose sum is σ = 1442322141876. Its totient is φ = 274728027008.

The previous prime is 686820067511. The next prime is 686820067553. The reversal of 686820067540 is 45760028686.

It can be written as a sum of positive squares in 2 ways, for example, as 341221876164 + 345598191376 = 584142^2 + 587876^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17170501669 + ... + 17170501708.

It is an arithmetic number, because the mean of its divisors is an integer number (120193511823).

Almost surely, 2^686820067540 is an apocalyptic number.

It is an amenable number.

686820067540 is an abundant number, since it is smaller than the sum of its proper divisors (755502074336).

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

686820067540 is a wasteful number, since it uses less digits than its factorization.

686820067540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34341003386 (or 34341003384 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 686820067540 in words is "six hundred eighty-six billion, eight hundred twenty million, sixty-seven thousand, five hundred forty".