1688862688861 has 8 divisors (see below), whose sum is σ = 1705757375448. Its totient is φ = 1671971400000.

The previous prime is 1688862688823. The next prime is 1688862688873.

1688862688861 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 1490093841636 + 198768847225 = 1220694^2 + 445835^2 .

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 1688862688861 - 2¹¹ = 1688862686813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688862688661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155571 + ... + 1844431.

It is an arithmetic number, because the mean of its divisors is an integer number (213219671931).

Almost surely, 2^{1688862688861} is an apocalyptic number.

It is an amenable number.

1688862688861 is a deficient number, since it is larger than the sum of its proper divisors (16894686587).

1688862688861 is a wasteful number, since it uses less digits than its factorization.

1688862688861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698863.

The product of its digits is 679477248, while the sum is 76.

The spelling of 1688862688861 in words is "one trillion, six hundred eighty-eight billion, eight hundred sixty-two million, six hundred eighty-eight thousand, eight hundred sixty-one".