686413143440 has 20 divisors (see below), whose sum is σ = 1595910558684. Its totient is φ = 274565257344.

The previous prime is 686413143419. The next prime is 686413143499. The reversal of 686413143440 is 44341314686.

It can be written as a sum of positive squares in 2 ways, for example, as 542231940496 + 144181202944 = 736364^2 + 379712^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 686413143391 and 686413143400.

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, 4290082067 + ... + 4290082226.

Almost surely, 2^686413143440 is an apocalyptic number.

It is an amenable number.

686413143440 is an abundant number, since it is smaller than the sum of its proper divisors (909497415244).

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

686413143440 is a wasteful number, since it uses less digits than its factorization.

686413143440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8580164306 (or 8580164300 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 44.

The spelling of 686413143440 in words is "six hundred eighty-six billion, four hundred thirteen million, one hundred forty-three thousand, four hundred forty".