6687538357866 has 8 divisors (see below), whose sum is σ = 13375076715744. Its totient is φ = 2229179452620.

The previous prime is 6687538357861. The next prime is 6687538357873.

6687538357866 is nontrivially palindromic in base 10.

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

6687538357866 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6687538357791 and 6687538357800.

It is not an unprimeable number, because it can be changed into a prime (6687538357861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557294863150 + ... + 557294863161.

It is an arithmetic number, because the mean of its divisors is an integer number (1671884589468).

Almost surely, 2^{6687538357866} is an apocalyptic number.

6687538357866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6687538357866 is a wasteful number, since it uses less digits than its factorization.

6687538357866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114589726316.

The product of its digits is 7315660800, while the sum is 78.

The spelling of 6687538357866 in words is "six trillion, six hundred eighty-seven billion, five hundred thirty-eight million, three hundred fifty-seven thousand, eight hundred sixty-six".