688488342681 has 8 divisors (see below), whose sum is σ = 930913815744. Its totient is φ = 452527549040.

The previous prime is 688488342673. The next prime is 688488342691. The reversal of 688488342681 is 186243884886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 688488342681 - 2³ = 688488342673 is a prime.

It is a super-2 number, since 2×688488342681² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (688488342691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1616169606 + ... + 1616170031.

It is an arithmetic number, because the mean of its divisors is an integer number (116364226968).

Almost surely, 2^688488342681 is an apocalyptic number.

It is an amenable number.

688488342681 is a deficient number, since it is larger than the sum of its proper divisors (242425473063).

688488342681 is a wasteful number, since it uses less digits than its factorization.

688488342681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232339711.

The product of its digits is 113246208, while the sum is 66.

The spelling of 688488342681 in words is "six hundred eighty-eight billion, four hundred eighty-eight million, three hundred forty-two thousand, six hundred eighty-one".