168986986873 has 4 divisors (see below), whose sum is σ = 168989491620. Its totient is φ = 168984482128.

The previous prime is 168986986871. The next prime is 168986986933. The reversal of 168986986873 is 378689689861.

168986986873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 378689689861 = 7 ⋅54098527123.

It can be written as a sum of positive squares in 2 ways, for example, as 114736657984 + 54250328889 = 338728^2 + 232917^2 .

It is a cyclic number.

It is not a de Polignac number, because 168986986873 - 2¹ = 168986986871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168986986793 and 168986986802.

It is not an unprimeable number, because it can be changed into a prime (168986986871) 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 3 ways as a sum of consecutive naturals, for example, 1148290 + ... + 1287067.

It is an arithmetic number, because the mean of its divisors is an integer number (42247372905).

Almost surely, 2^168986986873 is an apocalyptic number.

It is an amenable number.

168986986873 is a deficient number, since it is larger than the sum of its proper divisors (2504747).

168986986873 is an equidigital number, since it uses as much as digits as its factorization.

168986986873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504746.

The product of its digits is 1504935936, while the sum is 79.

The spelling of 168986986873 in words is "one hundred sixty-eight billion, nine hundred eighty-six million, nine hundred eighty-six thousand, eight hundred seventy-three".