686686585 has 8 divisors (see below), whose sum is σ = 887410440. Its totient is φ = 507091584.

The previous prime is 686686579. The next prime is 686686687. The reversal of 686686585 is 585686686.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 35569296 + 651117289 = 5964^2 + 25517^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 686686585 - 2¹³ = 686678393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5282140 + ... + 5282269.

It is an arithmetic number, because the mean of its divisors is an integer number (110926305).

Almost surely, 2^686686585 is an apocalyptic number.

686686585 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

686686585 is a deficient number, since it is larger than the sum of its proper divisors (200723855).

686686585 is a wasteful number, since it uses less digits than its factorization.

686686585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10564427.

The product of its digits is 16588800, while the sum is 58.

The square root of 686686585 is about 26204.7053980769. The cubic root of 686686585 is about 882.2388690968.

The spelling of 686686585 in words is "six hundred eighty-six million, six hundred eighty-six thousand, five hundred eighty-five".