688648667718 has 192 divisors, whose sum is σ = 1605167020800. Its totient is φ = 195293272320.

The previous prime is 688648667687. The next prime is 688648667723. The reversal of 688648667718 is 817766846886.

It is a self number, because there is not a number n which added to its sum of digits gives 688648667718.

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, 890877580 + ... + 890878352.

It is an arithmetic number, because the mean of its divisors is an integer number (8360244900).

Almost surely, 2^688648667718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688648667718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (802583510400).

688648667718 is an abundant number, since it is smaller than the sum of its proper divisors (916518353082).

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

688648667718 is a wasteful number, since it uses less digits than its factorization.

688648667718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235 (or 1216 counting only the distinct ones).

The product of its digits is 1040449536, while the sum is 75.

The spelling of 688648667718 in words is "six hundred eighty-eight billion, six hundred forty-eight million, six hundred sixty-seven thousand, seven hundred eighteen".