1688992998861 has 8 divisors (see below), whose sum is σ = 2573703617344. Its totient is φ = 965138856480.

The previous prime is 1688992998841. The next prime is 1688992998871.

1688992998861 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 1688992998861 - 2¹⁵ = 1688992966093 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 (1688992998841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40214119000 + ... + 40214119041.

It is an arithmetic number, because the mean of its divisors is an integer number (321712952168).

Almost surely, 2^{1688992998861} is an apocalyptic number.

It is an amenable number.

1688992998861 is a deficient number, since it is larger than the sum of its proper divisors (884710618483).

1688992998861 is an equidigital number, since it uses as much as digits as its factorization.

1688992998861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80428238051.

The product of its digits is 1934917632, while the sum is 84.

The spelling of 1688992998861 in words is "one trillion, six hundred eighty-eight billion, nine hundred ninety-two million, nine hundred ninety-eight thousand, eight hundred sixty-one".