686617533138 has 16 divisors (see below), whose sum is σ = 1445510596320. Its totient is φ = 216826589376.

The previous prime is 686617533089. The next prime is 686617533139. The reversal of 686617533138 is 831335716686.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686617533139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3011480295 + ... + 3011480522.

It is an arithmetic number, because the mean of its divisors is an integer number (90344412270).

Almost surely, 2^686617533138 is an apocalyptic number.

686617533138 is an abundant number, since it is smaller than the sum of its proper divisors (758893063182).

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

686617533138 is a wasteful number, since it uses less digits than its factorization.

686617533138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6022960841.

The product of its digits is 13063680, while the sum is 57.

The spelling of 686617533138 in words is "six hundred eighty-six billion, six hundred seventeen million, five hundred thirty-three thousand, one hundred thirty-eight".