688568856885 has 384 divisors, whose sum is σ = 1656722156544. Its totient is φ = 266051174400.

The previous prime is 688568856853. The next prime is 688568856887. The reversal of 688568856885 is 588658865886.

It is not a de Polignac number, because 688568856885 - 2⁵ = 688568856853 is a prime.

It is a super-2 number, since 2×688568856885² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

688568856885 is a modest number, since divided by 68856885 gives 6885 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688568856887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 69540435 + ... + 69550335.

It is an arithmetic number, because the mean of its divisors is an integer number (4314380616).

Almost surely, 2^688568856885 is an apocalyptic number.

688568856885 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

688568856885 is an abundant number, since it is smaller than the sum of its proper divisors (968153299659).

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

688568856885 is a wasteful number, since it uses less digits than its factorization.

688568856885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9995 (or 9983 counting only the distinct ones).

The product of its digits is 7077888000, while the sum is 81.

Subtracting from 688568856885 its reverse (588658865886), we obtain a palindrome (99909990999).

The spelling of 688568856885 in words is "six hundred eighty-eight billion, five hundred sixty-eight million, eight hundred fifty-six thousand, eight hundred eighty-five".