686757757686 has 256 divisors, whose sum is σ = 2005425838080. Its totient is φ = 150782238720.

The previous prime is 686757757663. The next prime is 686757757687.

686757757686 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686757757687) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3686880 + ... + 3868668.

It is an arithmetic number, because the mean of its divisors is an integer number (7833694680).

Almost surely, 2^686757757686 is an apocalyptic number.

686757757686 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 686757757686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1002712919040).

686757757686 is an abundant number, since it is smaller than the sum of its proper divisors (1318668080394).

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

686757757686 is a wasteful number, since it uses less digits than its factorization.

686757757686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181879.

The product of its digits is 4978713600, while the sum is 78.

The spelling of 686757757686 in words is "six hundred eighty-six billion, seven hundred fifty-seven million, seven hundred fifty-seven thousand, six hundred eighty-six".