688818888823 has 16 divisors (see below), whose sum is σ = 766869364800. Its totient is φ = 614633598720.

The previous prime is 688818888809. The next prime is 688818888859. The reversal of 688818888823 is 328888818886.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688818888823 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 688818888823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688818888883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5870083 + ... + 5986276.

It is an arithmetic number, because the mean of its divisors is an integer number (47929335300).

Almost surely, 2^688818888823 is an apocalyptic number.

688818888823 is a deficient number, since it is larger than the sum of its proper divisors (78050475977).

688818888823 is a wasteful number, since it uses less digits than its factorization.

688818888823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11856522.

The product of its digits is 603979776, while the sum is 76.

The spelling of 688818888823 in words is "six hundred eighty-eight billion, eight hundred eighteen million, eight hundred eighty-eight thousand, eight hundred twenty-three".