688661166886 has 64 divisors (see below), whose sum is σ = 1309317912576. Its totient is φ = 263846678400.

The previous prime is 688661166859. The next prime is 688661166889.

688661166886 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688661166889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59862211 + ... + 59873713.

It is an arithmetic number, because the mean of its divisors is an integer number (20458092384).

Almost surely, 2^688661166886 is an apocalyptic number.

688661166886 is a deficient number, since it is larger than the sum of its proper divisors (620656745690).

688661166886 is a wasteful number, since it uses less digits than its factorization.

688661166886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17957.

The product of its digits is 191102976, while the sum is 70.

The spelling of 688661166886 in words is "six hundred eighty-eight billion, six hundred sixty-one million, one hundred sixty-six thousand, eight hundred eighty-six".