686511666400 has 576 divisors, whose sum is σ = 2101329506304. Its totient is φ = 213663744000.

The previous prime is 686511666389. The next prime is 686511666403. The reversal of 686511666400 is 4666115686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686511666403) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 317681320 + ... + 317683480.

It is an arithmetic number, because the mean of its divisors is an integer number (3648141504).

Almost surely, 2^686511666400 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 686511666400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1050664753152).

686511666400 is an abundant number, since it is smaller than the sum of its proper divisors (1414817839904).

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

686511666400 is a wasteful number, since it uses less digits than its factorization.

686511666400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323 (or 2310 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 686511666400 in words is "six hundred eighty-six billion, five hundred eleven million, six hundred sixty-six thousand, four hundred".