686340043686 has 192 divisors, whose sum is σ = 1793643532800. Its totient is φ = 193803192000.

The previous prime is 686340043673. The next prime is 686340043757.

686340043686 is a `hidden beast` number, since 68 + 63 + 400 + 43 + 6 + 86 = 666.

686340043686 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7527591 + ... + 7618221.

It is an arithmetic number, because the mean of its divisors is an integer number (9341893400).

Almost surely, 2^686340043686 is an apocalyptic number.

686340043686 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 686340043686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896821766400).

686340043686 is an abundant number, since it is smaller than the sum of its proper divisors (1107303489114).

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

686340043686 is a wasteful number, since it uses less digits than its factorization.

686340043686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90744 (or 90727 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 54.

The spelling of 686340043686 in words is "six hundred eighty-six billion, three hundred forty million, forty-three thousand, six hundred eighty-six".