686250786816 has 760 divisors, whose sum is σ = 2476647902080. Its totient is φ = 185752092672.

The previous prime is 686250786811. The next prime is 686250786817. The reversal of 686250786816 is 618687052686.

686250786816 is a `hidden beast` number, since 6 + 8 + 62 + 507 + 8 + 68 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686250786811) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 36118462455 + ... + 36118462473.

Almost surely, 2^686250786816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686250786816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238323951040).

686250786816 is an abundant number, since it is smaller than the sum of its proper divisors (1790397115264).

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

686250786816 is an frugal number, since it uses more digits than its factorization.

686250786816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 63.

The spelling of 686250786816 in words is "six hundred eighty-six billion, two hundred fifty million, seven hundred eighty-six thousand, eight hundred sixteen".