1687018666868 has 12 divisors (see below), whose sum is σ = 2972096645700. Its totient is φ = 837848196672.

The previous prime is 1687018666867. The next prime is 1687018666889. The reversal of 1687018666868 is 8686668107861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 964583265424 + 722435401444 = 982132^2 + 849962^2 .

It is a super-2 number, since 2×1687018666868² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687018666867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1415283521 + ... + 1415284712.

It is an arithmetic number, because the mean of its divisors is an integer number (247674720475).

Almost surely, 2^{1687018666868} is an apocalyptic number.

It is an amenable number.

1687018666868 is a deficient number, since it is larger than the sum of its proper divisors (1285077978832).

1687018666868 is a wasteful number, since it uses less digits than its factorization.

1687018666868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830568386 (or 2830568384 counting only the distinct ones).

The product of its (nonzero) digits is 222953472, while the sum is 71.

The spelling of 1687018666868 in words is "one trillion, six hundred eighty-seven billion, eighteen million, six hundred sixty-six thousand, eight hundred sixty-eight".