1688684868861 has 8 divisors (see below), whose sum is σ = 2255696061024. Its totient is φ = 1123731794640.

The previous prime is 1688684868847. The next prime is 1688684868887.

1688684868861 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 1688684868861 - 2⁶ = 1688684868797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688684868161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514527570 + ... + 514530851.

It is an arithmetic number, because the mean of its divisors is an integer number (281962007628).

Almost surely, 2^{1688684868861} is an apocalyptic number.

It is an amenable number.

1688684868861 is a deficient number, since it is larger than the sum of its proper divisors (567011192163).

1688684868861 is a wasteful number, since it uses less digits than its factorization.

1688684868861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029058971.

The product of its digits is 1358954496, while the sum is 78.

The spelling of 1688684868861 in words is "one trillion, six hundred eighty-eight billion, six hundred eighty-four million, eight hundred sixty-eight thousand, eight hundred sixty-one".