686776320000 has 1190 divisors, whose sum is σ = 2685276742632. Its totient is φ = 175177728000.

The previous prime is 686776319989. The next prime is 686776320011. The reversal of 686776320000 is 23677686.

686776320000 is a `hidden beast` number, since 6 + 8 + 6 + 7 + 7 + 632 + 0 + 0 + 0 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (686776319989) and next prime (686776320011).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 69 ways as a sum of consecutive naturals, for example, 29859839989 + ... + 29859840011.

Almost surely, 2^686776320000 is an apocalyptic number.

686776320000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686776320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1342638371316).

686776320000 is an abundant number, since it is smaller than the sum of its proper divisors (1998500422632).

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

686776320000 is an frugal number, since it uses more digits than its factorization.

686776320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

Adding to 686776320000 its reverse (23677686), we get a palindrome (686799997686).

The spelling of 686776320000 in words is "six hundred eighty-six billion, seven hundred seventy-six million, three hundred twenty thousand".